Question

Karla is given the equation 10x + 15 = 20 to solve. She says the solution is 1/2 . Which reason justifies her solution? HELP THIS IS URGENT

Answer 1

10x + 15 = 20 so 10x = 20 - 15 =5, and 10x=5 means  x=5/10=1/2

Answer 2

10 x + 15 = 20
10 x + 15 - 15 = 20 - 15
10 x = 5
x = 5 : 10
x = 1/2  ( the solution )
We can justify it:
10 * 1/2 + 15 = 20
5 + 15 = 20
20 = 20  ( correct )