Question

ecuacion método de igualación por favor ayuda​

Answer 1

1)

x + y = 7

5x - 2y = -7

7 - y -7 + 2y

____ = ______

1 5

5 (7 - y) = -7 + 2y

35 - 5y = -7 + 2y

-5y - 2y = -7 - 35

(-) -7y = -42

y = 42/7

y = 6

x + y = 7

x + 6 = 7

x = 7 - 6

x = 1

5x - 2y = -7

5x - 2(6) = -7

5x - 12 = -7

5x = -7 + 12

5x = 5

x = 5/5

x = 1

R// x = 1; y = 6

2)

x + 2y = 4

3x - y = 5

4 - 2y 5 + y

_____ = ______

1 3

3 (4 - 2y) = 5 + y

12 - 6y = 5 + y

-6y -y = 5 - 12

(-) -7y = -7

y = 7/7

y = 1

x + 2y = 4

x + 2(1) = 4

x + 2 = 4

x = 4 - 2

x = 2

3x - y = 5

3x - 1 = 5

3x = 5 + 1

3x = 6

x = 6/3

x = 2

R// x = 2; y = 1

3)

2x + y = -10

x - 3y = 2

-10 - y 2 + 3y

_____ = ______

2 1

-10 - y = 2 (2 + 3y)

-10 - y = 4 + 6y

-y - 6y = 4 + 10

(-) -7y = 14

y = -14/7

y = -2

2x + y = -10

2x - 2 = -10

2x = -10 + 2

2x = -8

x = -8/2

x = -4

x - 3y = 2

x - 3(-2) = 2

x + 6 = 2

x = 2 - 6

x = -4

R// x = -4; y = -2

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