Question

Use substitution to solve for x in the system of equations.

10x + 2y = 30
4x + y = 4

A. x = -11

B. x = 11

C. x = 13

D. x = 15

Answer 1

Equation 1) 10x + 2y = 30
Equation 2) 4x + y = 4

Multiply all of equation 2 by 2.

2) 2(4x + y = 4)

2) 8x + 2y = 8
1) 10x + 2y = 30

Subtract equations from each other.

-2x = -22

Divide both sides by -2.

x = -22/-2

x = 11

B) x = 11

~Hope I helped!~