Answer:
The mistake is at the second step of the function.
Step-by-step explanation:
Using the functions given you can shorten the equation from 3x-2y=13 to 3x-2(3x+4)=13.
Using distribution -2 is multiplied by 3x and 4. Instead of getting "-6x-8", they forgot to distribute the negative sign of the 2 to 4.
