Question

What is the value of the y coordinate of the solution to the systems of equations x+2y=9 and x-y=3

Answer 1

6

Explanation:

Minus both from each other;

x=2y=9

x-y=3

x cancels, 2y-y= y; 9-3=6

Therefore; y=6

Answer 2

y = 2

Explanation:

(1) x + 2y = 9

(2) x - y = 3

Subtract (2) from (1)

3y = 6

y = 2

The y-coordinate is y = 2.

The graphs of the two equations intersect at (5, 2).