If b is the midpoint of ac, find bc (ab=3x-1 and ac=8x-20)

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?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

How to find the exponential function y=ca^x, with points (1,2) and (2,1)