Question

Solve the following system of equations . Enter the y-coordinate of the solution . Round your answer to the nearest tenth. 5x+2y =7. -2x+6y=9

Answer 1

5x + 2y = 7
multiplying this equation by 2
10x + 4y = 14 ...(A)

-2x + 6y = 9
multiplying this equation by 5
-10x + 30y = 45 ... (B)

Add (A) and (B),
10x-10x + 4y +30y = 14+45

0 + 34y = 59

y = 59/34
y = 1.7