Question

Use substitution to determine which of the following is a solution for x in the equation:

x + 4 = 10

A. x = 14

B. x = 4

C. x = 6

D. x = 8

Answer 1

x = 6

Explanation:

The easier method to do this is to just subtract 4 from both sides, like so:

x + 4 = 10

- 4 - 4

________

x = 6

However, since it' asking for the substitution method, we plug in the x-values to see if they come out to a sum of 10:

x + 4 = 10

A. 14 + 4 = 10

18 = 10 Does not match

B. 4 + 4 = 10

8 = 10 Does not match

C. 6 + 4 = 10

10 = 10 Matches

D. 8 + 4 = 10

12 = 10 Does not match

So this means, x = 6 is the final answer.

Answer 2

x = 6

Explanation:

x+4−4=10−4

x=6