Use Inequalities to Describe R in Terms of Its Vertical $\begin{array} { c } 0 \leq y \leq 49 \\\frac { y } { 7 } \leq x \leq \sqrt { y }\end{array}$

Multiple Choice

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