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9.1+b.2 = 1
9 + 2b = 1
2b = 1-9
2b = -8
b = -4
b. (b+1)x + 7y = -8
xb+x +7y = -8
2b + 2 + 7(-2) = -8
2b - 12 = -8
2b = -8+12
2b = 4
b = 2
c. 2x-by = -10
2b -4b = -10
-2b = -10
b = 5