99y
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x + 7y = 7 ⇒ 7y = -x + 7 ⇒ y = -x/7 + 1 ⇒ y intercept is 1.
5y+8=7y 2y=8 y=4
This simplifies to 6+13y If you meant 9+7y-(3+6y) then it becomes 6+y It is not clear from the problem which you meant.
3
y-3x+6y=12 7y=3x+12 y=3x/7 +12/7