18. What is the y-intercept of the line that passes
through the points (1, 1) and (5, 13)?

-2

(The coordinate point is (0,-2))

Step-by-step explanation:

First, make an equation of the line.

Start off with finding the slope:

Slope = (13-1)/(5-1) = 12/4 = 3

Then solve for the y-intercept though substitution and simplification:

y=mx+b --> 1=3(1)+b --> 1=3+b --> b= -2

So the answer is -2.

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.