Question

What is the value of x in the equation x – y = 30, when y = 15?

Answer 1

 x – y = 30, when y = 15

Then plug in the value

x - 15 = 30

Add 15 to both sides

x -15 + 15 = 30 + 15

Simplify:

x = 45

Answer 2

X-y=30 <=> x-15=30 =>x=30+15 => x=45