Question 1170825
rewrite first as
6x-2y=6, multiplying by -2
4x+2y=14
10x=20
x=2
y=3
(2, 3)
-
substitute in the second
a-3(-4a+1)=10
a+12a-3=10
a=1
b=-3
(1, -3)

x+y-a+b=5-1-3=1
Do they mean (x+y)-(a+b)? That answer is 3