SOLUTION: 10. Select the choice below that could be the first step in solving the following system of equations using substitution: y = 4x - 10 5

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Question 785932: 10. Select the choice below that could be the first step in solving the following system of equations using substitution: y = 4x - 10 5 - x = y
A. Multiply the second equation by 4
B. Multiply the first equation by 2
C. Replace the left side of the first equation with the second equation
D. Write the first equation in terms of x
PLEASE HELP
Answer by xinxin(76) (Show Source):
You can put this solution on YOUR website!
D
Substitution is a method that requires you to replace a variable with other variables. In this question, there are two variables (X and Y), so you need to find out the expression of X in terms of Y, and vice versa.
The other 3 choices can also be used for solving the system. Substitution is primarily used in solving quadratic functions.

SOLUTION: 10. Select the choice below that could be the first step in solving the following system of equations using substitution: y = 4x - 10 5 - x = y A. Multiply the second equation