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Equation# 1 : x + y = 12

Equation# 2:

-x = -y - 10

x = y + 10 ; multiply the equation# 2 with -1

Now, we know that x is y + 10

Then, replace that x in equation#1

x + y = 12

(y+10) + y = 12 ;replace x with y + 10

y + 10 + y = 12

2y + 10 = 12

2y = 12 - 10

2y = 2

y = 2/2

y = 1

Now, we know that y is 1. Then replace y in equation# 1

x + y = 12

x + (1) = 12 ; replace y with 1

x + 1 = 12

x = 12 - 1

x = 11

The answer is x = 11 and y = 1.

Q: What is X plus y equals 12. And -x equals -y-10?

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