SAT Question 4efea6a3: Area and Volume answer and explanation with Desmos solution

The area of a rectangle can be calculated by multiplying the length of its longest side by the length of its shortest side. It's given that the area of the rectangle is $57$ square inches and the length of the longest side of the rectangle is $19$ inches. Let $x$ represent the length, in inches, of the shortest side of this rectangle. It follows that $57=19x$. Dividing both sides of this equation by $19$ yields $3=x$. Therefore, the length, in inches, of the shortest side of the rectangle is $3$.