Question

X + y = 9
X + 3y = 13

Answer 1

Answer: x = 7 and y = 2

X + y = 9 ----equation1

X + 3y = 13 ------equation2

- - -

-2y = -4

y = 2

put the y value back in equation 1

x + 2 = 9

x = 9 - 2

x = 7