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andreyandreev [35.5K]
4 years ago
8

Find the coordinates

Mathematics
1 answer:
Irina-Kira [14]4 years ago
4 0

Answer:

The answer to your question is   -3, 7

Step-by-step explanation:

Data

                    x  +  y  = 4   ------------ Equation l

                  7x + 9y  = 42 -----------  Equation ll

Process

1.- Solve the system by elimination

- Multiply equation l by -7

                  -7x - 7y = - 28

                    7x+9y =   42

2.- Simplify

                   0  + 2y = 14

3.- Solve for y

                            y = 14/2

                           y = 7

4.- Substitute y in equation l to find x

                      x  + 7 = 4

Solve for x

                      x = 4 - 7

                      x = -3

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