Solve algebraically: 6a + b = 16 ..... 5a - 2b = 19
first equation: 6a + b = 16 second equation: 5a - 2b = 19 from 2 times first equation + second equation 17a = 51 meaning a = 3
.... from the first equation 6(3) + b = 16 therefore b = - 2
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