What's greater -5/7 or -2/7

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?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)