7n + 2 = 4 + 17
7n = -2 + 4 + 17
7n = 19
n = 19/7
your answer is 19/7 (or 2.71)
This is a bit of a guess, but I think probably a) +4 and also a) -215
Add y to both sides in 1st equation
-2x=y
sub -2x for y in2nd equation
3x-(-2x)=10
3x+2x=10
5x=10
divide 5
x=2
sub back
-2x=y
-2(2)=y
-4=y
(x,y)
(2,-4)
C is ans
