Answered

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5x + 9y = 31 and - 2x - y = 11

Sagot :

5x + 9y = 31 -------------(1)

-2x - y = 11 ---------------(2)

Multiply through equation (2) by 9

-18x - 9y = -99---------------(3)

Add equation(1) and (2)

-13x = -68

Divide both-side by -13

x = 5.23

Substitute x in equation(1) and solve for y

-2(5.23) - y = 11

-10.46 - y = 11

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