A=10 that’s what I came up
Answer:
C= -5
D = 7
Step-by-step explanation:

Answer:
D. 3x - 3
Step-by-step explanation:
To find (f-g)(x) you have to subtract each fuction
(f-g)(x) = f(x) - g(x)
(f-g)(x) = 5x -2 - (2x+1)
(f-g)(x) = 5x -2 -2x -1
(f-g)(x) = 3x -3
The first sentence → x - 2y = -1
the second one → 3x - 2y = -3
multiply the first one by -1
you can get → -x + 2y = 1
plus two sentences together
you can get → 2x = -2
so you are able to know that x = -1
and y = 0