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b=-b+4
2b=4
b=2
maka y=x²+2x-6
y=y
x²+2x-6 = -x+4
x²+2x+x-6-4 = 0
x²+3x-10 = 0
(x+5)(x-2) = 0
x=-5 atau x=2
x=-5, y=-(-5)+4 = 9
x=2, y=-2+4 = 2
jd penyelesaian yg lainnya adalah (-5,9)