Question

Which of the following is an equation in one variable?

2x + 2y

x + 2 = 4

8 = x

4 + x / 3

(x - 8) / 3 = 9

5x = 10

Answer 1

x + 2 = 4

5 x = 10

because 1st one is not an equation

3rd , 4th and 5th also