Question

Karla is given the equation 10x + 15 = 20 to solve. She says the solution is 1 2 . Which reason justifies her solution? *A) Karla says that to solve the equation you first add 15 and then multiply by 10. *B) Karla says that to solve the equation you first multiply by 10 and then add 15. *C) Karla says that to solve the equation you first subtract 15 and then divide by 10. *D) Karla says that to solve the equation you first divide by 10 and then subtract 15

Answer 1

C. Karla says that to solve the equation you first subtract 15 and then divide by 10.

Karla is given the equation 10x + 15 = 20 to solve. She says the solution is 1/2

10x + 15 = 20
10x = 20 - 15 (subtract 5)
10x = 5 (divide by 10)
x = 5/10 = 1/2