Question

What is the value of x in the equation 3x - y = 18, when y = 27?
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Answer 1

Substitute in the y-value to the equation:

`3x-y=18\\\\3x-27=18\\\\3x=18+27\\\\3x=45\\\\x=15`

Therefore, the value of x is 15.

Answer 2

x=15

Explanation:

3x - y = 18

Let y= 27

3x - 27 = 18

Add 27 to each side

3x-27+27 = 18+27

3x= 45

Divide each side by 3

3x/3 = 45/3

x = 15