SAT Question 1b687ae3: Area and Volume answer and explanation with Desmos solution

The area, $A$, of a triangle is given by the formula $A=\frac{1}{2}bh$, where $b$ represents the length of the base of the triangle and $h$ represents its height. It’s given that the triangle has an area of $36$ square units and a height of $2$ units. Substituting $36$ for $A$ and $2$ for $h$ in the formula $A=\frac{1}{2}bh$ yields $36=\frac{1}{2}b(2)$, or $36=b$. Thus, the length, in units, of the base of this triangle is $36$.