Question

If 31x +43y = 117 and 43x+31y = 105 then, the find the value of x + y.
For what yalue of k will the following system of equations have unique so​

Answer 1

Answer: x - y = -1

Step-by-step explanation:

31x + 43y = 117 ——— 1.

43x + 31y = 105 ——— 2.

When we subtract 1. from 2., we get

12x - 12y = -12

=> x - y = -1

Therefore x - y = -1

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