Question

Which choice describes whether x = 19 is the solution of the equation 42 = 3x – 15? CLEAR CHECK x = 19 is not the solution because 3 • 19 – 15 = 3 • 4 = 12, not 42. x = 19 is the solution because 3 • 19 – 15 = 3 • 4 = 12. x = 19 is the solution because 3 • 19 – 15 = 57 – 15 = 42. x = 19 is not the solution because 3 • 19 – 15 = 57 – 15 = 42.

Answer 1

42 = 3x - 15   Since you know x = 19, you can plug in 19 for "x" in the equation

42 = 3(19) - 15

42 = 57 - 15

42 = 42    This is the solution

x = 19 is the solution because 3 • 19 – 15 = 57 – 15 = 42.  (3rd choice)