Question

What is the value of x in the equation 2x + 3y = 36, when y = 6

Answer 1

The value of x would be 9.

As we already know, a variable is an unknown number, so a number beside a variable, is basically multiplying the 2 numbers. Now lets replace y with 6.

2x+3X6=36. Well 3X6 is 18, so 2x+18=36. Now we can reverse backwards.

36-18=18, so something times 2 is 18, 18 divided by 2 is 9. 2X9+3X6=36

Answer 2

The value of x is 9. 
2*9 + 3*6 = 18 + 18 = 36.