Question

métodos de igualación .xfavor doy coronitas ​

Answer 1

1)

3x - 2y = -2

5x + 8y = -60

3x = -2 + 2y

x = (-2 + 2y) / 3

5x = -60 - 8y

x = (-60 - 8y) / 5

(-2 + 2y) / 3 = (-60 - 8y) / 5

(5)(-2 + 2y) = (3)(-60 - 8y)

-10 + 10y = -180 - 24y

-10 + 180 = -24y - 10y

170 = -34y

y = -170/34

y = -5

3x - 2y = -2

3x - 2(-5) = -2

3x + 10 = -2

3x = -2 - 10

3x = -12

x = -12/3

x = -4

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2)

7x + 4y = 13

5x - 2y = 19

7x = 13 - 4y

x = (13 - 4y) / 7

5x = 19 + 2y

x = (19 + 2y) / 5

(13 - 4y) / 7 = (19 + 2y) / 5

(5)(13 - 4y) = (7)(19 + 2y)

65 - 20y = 133 + 14y

65 - 133 = 14y + 20y

-68 = 34y

y = -68/34

y = -2

7x + 4y = 13

7x + 4(-2) = 13

7x - 8 = 13

7x = 13 + 8

7x = 21

x = 21/7

x = 3

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3)

3x + 5y = 7

2x - y = -4

3x = 7 - 5y

x = (7 - 5y) / 3

2x = -4 + y

x = (-4 + y) / 2

(7 - 5y) / 3 = (-4 + y) / 2

(2)(7 - 5y) = (3)(-4 + y)

14 - 10y = -12 + 3y

14 + 12 = 3y + 10y

26 = 13y

y = 26/13

y = 2

3x + 5y = 7

3x + 5(2) = 7

3x + 10 = 7

3x = 7 - 10

3x = -3

x = -3/3

x = -1

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4)

x - 2y = -4

3x + y = 9

x = -4 + 2y

3x = 9 - y

x = (9 - y) / 3

-4 + 2y = (9 - y) / 3

(3)(-4 + 2y) = 9 - y

-12 + 6y = 9 - y

-12 - 9 = -y - 6y

-21 = -7y

y = -21/-7

y = 3

x - 2y = -4

x - 2(3) = -4

x - 6 = -4

x = -4 + 6

x = 2