Step by step explanation: I'm Sorry this answer is late but here! I don't really get number 2 I'm sorry.
question 1
x=-y
2x-y=-6
x=-y
2(-y)-y=-6
x=-y
y=2
x=-(2
y=2
(-2,2)
x=-2,
y=2
Question 2
-2x + 6y = 30
-2x + 6y + -6y = 30 + -6y
-2x + 0 = 30 + -6y
-2x = 30 + -6y
x = -15 + 3y
x = -15 + 3y
