Question

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

Which reason justifies her solution?
Responses
A Karla says that to solve the equation you first add 15 and then multiply by 10.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.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.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

[AI-generated answer — Bot GPT-4 Turbo]

The correct justification for Karla's solution is:

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

The proper steps to solve the equation 10x + 15 = 20 are to first isolate the term with the variable (10x) by subtracting 15 from both sides of the equation to get 10x = 5, and then to solve for x by dividing both sides by 10 to get x = 5/10, which simplifies to x = 1/2.