5x – 15 = 2x + 6
what’s the answer

x = 7

Step-by-step explanation:

Step by step solution :

Step  1  :

Pulling out like terms :

1.1     Pull out like factors :

  3x - 21  =   3 • (x - 7)  

Equation at the end of step  1  :

Step  2  :

Equations which are never true :  

2.1      Solve :    3   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation :  

2.2      Solve  :    x-7 = 0  

Add  7  to both sides of the equation :  

                     x = 7  

One solution was found :

                  x = 7  

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.