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
Mathematics
grandmamom12
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
10x + 2y = 30
4x + y = 4
A. x = 11
B. x = 11
C. x = 13
D. x = 15
1 Answer

1. User Answers cher
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!~