Question

Which of the following describes the correct process for solving the equation 3x+6=21 and arrives at the correct solution?

A. Divide both sides by 6 and then at 3 the solution is x=5

B. 562 both sides of the equation and then divide by 2 the solution is x=9

C. Subtract 6 from both sides of the equation and then divide by 3 the solution is x=8

D. Subtract 6 from both sides of the equation and then divide by 3 the solution is x=5

Answer 1

The correct solution is C

Subtract 6 from both sides of the equation
3x + 6 - 6 = 21 - 6
3x = 15

Then divide both sides by 3


`(3x)/(3) = (15)/(3)`

x = 5