Answer:
The solution is x=-2
The mistake could be in operation however here is the all operation
Step-by-step explanation:
Getting each term and sum each one

Check replacing in the original equation:

To find the inverse, interchange the variables and solve for y.
f^−1(x)=−25+5x/2
Answer:
b
Step-by-step explanation:
3x=y
X+Y=20
5=x and 15=y are the answer. You can use elimination or substitution or guess and check!