Joan bought 12 books for $87.00 which equation can be used to determine the price

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?

1. are the corresponding angles congruent 2. find the ratios of the corresponding sides 3. is triangle jkl congruent to triangle rst? if so what is the scale factor

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).