After a rotation of 180° about the origin, the coordinates of the vertices of the image of a triangle are A'(6,3), B'(-2, 1), and C (1,7). What is the y-coordinate of the pre-image for vertex
A?
(2 points)

jwjeh; hw; kjhekjhkjhwkejhkw

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

add 8+12 to get a simplified answer of 12r-20