-5b = 55
To get b by itself, divide both sides by -5.
(-5b)/(-5) = (55)/(-5)
-5 / -5 = 1, 55 / -5 = -11
1(b) = -11
b = -11
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4a - 5b = 74a +5b = 17From the first equation:4a = 7 + 5bsubstitute this value in the second equation:7 + 5b + 5b = 177 + 10b = 1710b = 10b = 1Now,solve for a :4a - 5(1) = 74a = 7 + 54a = 12a = 3
-86
(4, 3)
x(0.07) = 55 x = 55 / (0.07) x = 785.7142857...
The answer is 7.