Use inequalities to describe R in terms of its vertical and horizontal cross sections. R is the region bounded by y = x² and y = 7x.
A) Vertical cross sections:

\begin{array} { c } 0 \leq y \leq 49 \\\frac { y } { 7 } \leq x \leq \sqrt { y }\end{array}

Horizontal cross sections:

\begin{array} { c } 0 \leq x \leq 7 \\x ^ { 2 } \leq y \leq 7 x\end{array}

B) Vertical cross sections:

\begin{array} { c } 0 \leq x \leq 7 \\x ^ { 2 } \leq y \leq 7 x\end{array}

Horizontal cross sections:

\begin{array} { c } 0 \leq y \leq 49 \\\frac { y } { 7 } \leq x \leq \sqrt { y }\end{array}

C) Vertical cross sections:

\begin{array} { c } 0 \leq x \leq 49 \\x ^ { 2 } \leq y \leq 7 x\end{array}

Horizontal cross sections:

\begin{array} { c } 0 \leq y \leq 7 \\\frac { y } { 7 } \leq x \leq \sqrt { y }\end{array}

D) Vertical cross sections:

\begin{array} { c } 0 \leq y \leq 7 \\\frac { y } { 7 } \leq x \leq \sqrt { y }\end{array}

Horizontal cross sections:

\begin{array} { c } 0 \leq x \leq 49 \\x ^ { 2 } \leq y \leq 7 x\end{array}

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