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Find the value of x + y if 12 x+ 7y = 31 and 7 x + 12 y is 26 |
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Answer» Answer: x=2, y=1 Step-by-step explanation: 12x + 7y = 31 )×7 → 84x + 49y = 217 ----(1) 7X + 12Y = 26 )×12 → 84 x + 144y = 312----(2) (2) - (1) 144y - 49y = 312 - 217 95y = 95 y = 1 (1) ===> 12x + 7(1) = 31 12x = 31-7 12x = 24 x =2 |
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