How to find a perfect square or perfect cube

Simone claims the initial value and y-intercept are the same thing on a graph. is she correct? if you know that a line has a slope of and a y-intercept of 7, what is the equation for that line in slope-intercept form?

Solve the equation x/4 - 5= -8 -27 -12 -7 12

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base