Question

What is the value of x in the equation 3x –1/2 y = 18, when y = 27?
answers given 5 7 45 63

Answer 1

Answer:

10.5

Step-by-step explanation:

Substitute 27 instead of y into the equation:

$3x-\dfrac{1}{2}\cdot 27=18.$

Then

$3x-13.5=18,\\ \\3x=18+13.5,\\ \\3x=31.5,\\ \\x=\dfrac{31.5}{3}=10.5.$

Answer 2

For this case we have the following equation:

$3x- \frac {1} {2} y = 18$

We want to know the value of the variable x when $y = 27$

For this, we substitute:

$3x- \frac {1} {2} 27 = 18\\3x = 18 + \frac {27} {2}\\3x = \frac {36 + 27} {2}\\3x = \frac {63} {2}\\x = \frac {63} {6}\\x = \frac {21} {2}$

Answer:

$x = \frac {21} {2}\ when\ y = 27$