Exam 4: Systems of Equations

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Write the word or phrase that best completes each statement or answers the question. - 8x+5y=-22 -x+y=-

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Write the word or phrase that best completes each statement or answers the question. -x + 7y = -2 3x + y = 34

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Write the word or phrase that best completes each statement or answers the question. - x-4y=2 x=7+4y

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Write the word or phrase that best completes each statement or answers the question. -A system of two linear inequalities can have solutions in exactly three of the quadrants.

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work. Do not solve. -5x + 9y = -12 -4x - 4y = -32 A) Substitution B) Addition Answer: B Write the word or phrase that best completes each statement or answers the question. -A sum of money amounting to $3.10 consists of dimes and quarters. If there are 16 coins in all, how many are quarters?

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Write the word or phrase that best completes each statement or answers the question. -3x + y = 13 2x + 9y = -8

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Write the word or phrase that best completes each statement or answers the question. - 14x+14y=3\frac { 1 } { 4 } x + \frac { 1 } { 4 } y = 3 xy=6x - y = - 6

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Write the word or phrase that best completes each statement or answers the question. -A store sells televisions for $360 and digital video recorders for $270. At the beginning of the week its entire stock is worth $59,580. During the week it sells three quarters of the televisions and one Third of the digital video recorders for a total of $34,560. How many televisions and digital video Recorders did it have in its stock at the beginning of the week?

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Write the word or phrase that best completes each statement or answers the question. -Describe two advantages of the substitution method over the graphing method for solving systems of equations.

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Solve the problem. -Devon purchased tickets to an air show for 5 adults and 2 children. The total cost was $112. The cost of a childʹs ticket was $7 less than the cost of an adultʹs ticket. Find the price of an adultʹs ticket And a childʹs ticket.

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Is the ordered pair a solution of the given system of equations? -If the y term is missing in Is the ordered pair a solution of the given system of equations? -If the y term is missing in

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Write the word or phrase that best completes each statement or answers the question. -Under what condition(s) will a system of two linear inequalities have no solution?

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Write the word or phrase that best completes each statement or answers the question. -5x + 3y = 80 2x + y = 30

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Is the ordered pair a solution of the given system of equations? -(-1, 3), xx -+ yy == -24

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work. Do not solve. -5x + 9y = -12 -4x - 4y = -32 A) Substitution B) Addition Answer: B Write the word or phrase that best completes each statement or answers the question. -Paul invested four times as much money in an account paying 4% interest than he did in an account paying 1% interest. If the total interest paid was $595, how much did he invest in each?

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work. Do not solve. -5x + 9y = -12 -4x - 4y = -32 A) Substitution B) Addition Answer: B Write the word or phrase that best completes each statement or answers the question. -A retired couple has $140,000 to invest to obtain annual income. They want some of it invested in safe Certificates of Deposit yielding 7%. The rest they want to invest in AA bonds yielding 10% per Year. How much should they invest in each to realize exactly $12,500 per year?

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Write the word or phrase that best completes each statement or answers the question. -South Wind Vineyards uses 830 acres to plant Chardonnay and Riesling grapes. The vintner knows the profits will be greatest by planting 240 more acres of Chardonnay than Riesling. How Many acres of each grape should be planted?

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Write the word or phrase that best completes each statement or answers the question. -Give an equation that, along with the equation y = 6x + 1  forms a system whose only \text { forms a system whose only }

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work. Do not solve. -5x + 9y = -12 -4x - 4y = -32 A) Substitution B) Addition Answer: B Write the word or phrase that best completes each statement or answers the question. -While using the addition method, if the following occurs, what can you say about the graph of the system of equations? 3x - 7y = 8 - 3x + 7y = -8 0 = 0

(Short Answer)
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Write the word or phrase that best completes each statement or answers the question. -A student solved the system of equations x + 2y = 4 2x + 4y = 8 for x in the first equation, and substituted into the second equation. The yʹs also disappeared in the process. The student claimed that the system of equations has no solution. Is this correct?

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