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olga nikolaevna [1]
4 years ago
6

NEED HELP ASAP HELP ME

Mathematics
1 answer:
Roman55 [17]4 years ago
6 0

Answer:

The answer to your question is: x = -7

Step-by-step explanation:

Data

                       y - x = 9

                      10 + 2x = -2y

1.- Change the form of the equations

       

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

                   2x + 2y = -10                ---- (2)

Solve equation by elimination

Multiply (1) by 2

                 - 2x + 2y =  18

                   2x  + 2y = -10

                    0     4y = 8

                             y = 8/4

                             y = 2

Find the value of x (in equation 1)

                   - x + 2 = 9

                  - x = 9 - 2

                  - x = 7

                    x = -7

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