Question

1) The equation 20 + 4x = 100 was given on a test. Student A and B showed their work for the same problem. [2 points] Student A Student B T20 + 4x = 100 20 + 4x = 100 -4 -20 -20 420 + x = 96 +20 -20 4 X = 20 L X = 76 a) Which student used the correct steps to solve the equation?

Answer 1

The correct steps are:

20 + 4x = 100

20 + 4x - 20 = 100 - 20 Subtract 20 at both sides

4x = 80

4x/4 = 80/4 Divide by 4 at both sides

x = 20