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expeople1 [14]
2 years ago
9

Use the substitution method to solve the system of equations. x+y=11 -x=-y-9

Mathematics
1 answer:
allochka39001 [22]2 years ago
4 0
<h2>Answer:</h2>

Like you said, we need to use <u><em>substitution</em></u> to solve for y.

x + y = 11\\-1(-x = -y - 9)\\\\x + y = 11\\x = y + 9\\\\y + 9 + y = 11\\\\2y + 9 = 11\\\\2y = 20\\\\y = 10

Now that we've solved for y, we can plug in the number we got into one of the <u><em>original</em></u> equations. (You can choose either equation, but I will use the first one.)

x + 10 = 11\\\\x = 1

Now we have the solution of this system.

(1, 10)

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