The answers are the first, third, and last. I took the test.
Answer:
21
Step-by-step explanation:
Good luck ..have a nice day
Answer:

Step-by-step explanation:
Multiply both sides by 7 to get rid of the denominator on the Right Side (RS). Do the same for the left side (LS) by multiplying both sides by 5 to get:

Simplify: 
Divide both sides of the equation by 7 to get: 
Answer:
The third one :)
Step-by-step explanation:
By using the given pairs e.g (4,1 ) (8,6) on the graph plane