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5b + 5b = 2 x 5b
5b-32
5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21
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