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Find the solution of the system of equations. 9x + y = 283x + 3y = -12

Sagot :

(4, -8)

1) Let's find the solution for this Linear Equations System:

Let's use the Elimination/Addition method:

9x + y = 28

3x + 3y = -12​ x-3

9x + y = 28

-9x -9y = 36

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-8y = 64 Divide both sides by -8

y = -8

2) Plug into the simpler equation, the value of y=-8

9x +y = 28

9x -8 = 28

9x = 28+8

9x = 36

x= 4

3) So the solution is x=4 and y= -8

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