Question

What is the value of x in the equation
3x - y = 30, when y = 15?

Answer 1

x = 15

Explanation:

3x - y = 30

let y = 15

3x - 15 = 30

3x = 30 + 15

3x = 45

x = 45/3

x = 15

Let's check:

3x - y = 30

3(15) - 15 = 30

45 - 15 = 30

30 = 30

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Answer 2

x = 15

Explanation:

3x - y = 30

Given;

y = 15

To find;

value of 'x'

Putting the value of y in the given equation;

3x - 15 = 30

3x = 30 + 15

3x = 45

x = 45/3

x = 15