BeautyQueen97
BeautyQueen97 BeautyQueen97
  • 22-01-2019
  • Mathematics
contestada

Use substitution to solve the system of equations.
3x + 2y = 2
y = x - 9

(4, -5)
(-5, 4)
(4, 13)
(20, 11)

Respuesta :

MrsStrong
MrsStrong MrsStrong
  • 22-01-2019

Answer:

(4,-5)

Step-by-step explanation:

You can use substitution to substitute the answer options in for x and y or substitute an equation in to find each variable.

Substitute an equation is the traditional method and will allow you to solve without any answer options.

1. Substitute y=x - 9 into 3x+2y=2.

3x+2(x-9) = 2

3x+2x-18=2

5x-18=2

5x=20

x=4

2. Substitute x=4 into y=x-9.

y = 4-9

y=-5

(4,-5) is the solution.

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