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y=ax+b
-4a+b=7
4a+b=-3
----------- _
-8a=10
a=-5/4
-4*(-5/4)+b=7
5+b=7
b=2
y=-5/4x+2 /*4
5x+4y-8=0
b)
y=-5
y+5=0
c)
x=-7
x+7=0