Question

If m= 7x and m = 3x + 20, what is the value of x? a 10 4 7 5

Answer 1

Equate the expressions for m.
  7x = 3x + 20
  4x = 20 . . . . . . . subtract 3x
  x = 20/4 = 5 . . . divide by 4

The value of x is 5.