It is not possible to solve a single linear equation in two unknown variables (b and t).
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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
-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
(4, 3)
The answer is 7.