chilanka chilanka

03-02-2019
Mathematics

contestada

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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mathecoach mathecoach

03-02-2019

Answer:

217x + 131y = 913

131x + 217y = 827

131*I - 217*II

131*(217x + 131y) - 217*(131x + 217y) = 131*913 - 217*827

28427·x + 17161·y - 28427·x - 47089·y = -59856

- 29928·y = -59856

y = 2

217x + 131*2 = 913 --> x = 3

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