Use the substitution method to solve the system of equations. Choose the
correct ordered pair,
2y + 2x = 8
2y - 4x = 2
O A. (4,9)
O B. (3,7)
O C. (2,5)
O D. (1,3)

Respuesta :

Answer: OPTION D.

Step-by-step explanation:

1. You can solve for the variable "y" from the first equation:

[tex]2y + 2x = 8\\\\2y=8-2x\\\\y=\frac{8-2x}{2}\\\\y=4-x[/tex]

2. Now you must ubstitute the new equation into the second equation:

[tex]2y- 4x = 2\\\\2(4-x) - 4x = 2[/tex]

3. Solve for the variable "x" in order to find its value:

[tex]8-2x - 4x = 2\\\\-6x=2-8\\\\x=\frac{-6}{-6}\\\\x=1[/tex]

4. Now you need to substitute the value of "x" into the equation [tex]y=4-x[/tex] and then evaluate, in order to find the value of "y". This is:

[tex]y=4-(1)\\\\y=3[/tex]

Therefore the solution in the form [tex](x,y)[/tex], is:

[tex](1,3)[/tex]