What’s the value of x in the equation 3x - y = 18 when y = 27

Question

asked Oct 24, 2019 56.2k views

2 Answers

Michael Reneer · Answer 1 · 2019-10-27T02:22:48+0000

Firstly, we substitute y by 27 to form this equation:

3x - 27 = 18

Equation step-by-step:

3x = -27 = 18 → we take -27 to the right side of the equation

3x = 18 + 27 → we solve for 18 + 27

3x = 45 → we take 3 to the right side of the equation

x = 45 / 3 → we solve for 45 / 3

x = 15 → final answer

Hope it helped,

BioTeacher101

Ewan · Answer 2 · 2019-10-30T09:52:33+0000

You would have to insert the number into the variable. For example,

3x - 27 = 18

Then, you would isolate the x value (3x).

3x = 18 + 27

Simplify.

Finally, divide both sides by the coefficient.

( 45)/(3) = (3x)/(3)

You end up with

x = 15