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Nat2105 [25]
3 years ago
11

A pair of equations is shown below.

Mathematics
1 answer:
Ket [755]3 years ago
4 0
You may substitute -2x + 11 for the y in the first equation.

3x - (-2x + 11) = 9

3x + 2x - 11 = 9   Distribute the negative.

5x - 11 = 9   Combine like terms

5x = 20   Add 11 to both sides

x = 4    Divide both sides by 5.

Substitute 4 into one of the equations for x to solve for y.

3(4) - y = 9

12 - y = 9

-y = -3

y = 3
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