Question

Question #625d7

Answer 1

`x,y = 2,1`

Explanation:

`A: qquad color(red)(3)x + 7y = 13`
`B: qquad color{red}{-9}x + 3y = -15`

`3 times A: qquad 9x + 21y = 39`

`(3 times A) + B implies qquad color(green)(9x + 21y) + color(blue)((-9x + 3y)) = color(green)(39) + color(blue)((-15))`

OR:

`24y = 24 implies y = 1`

plug back into A:
`3x + 7(1) = 13 implies x = 2`