10) 2(x + 5) - x = 13
2x + 10 - x = 13
x = 3
y = 8
The answer to number 10 is (3,8)
11) 8x + 3y = -9
-8x + y = 29
4y = 20
y = 5
x = -3
The answer is (-3,5)
12) 3x = y + 4
x - y = 6
x = 6 + y
3(6 + y) = y + 4
18 + 3y = y + 4
2y = -14
y = -7
x = -1
The answer is (-1,7)
13) The answer is C
14) I think the answer is B but I’m not sure