Answer:
24
Step-by-step explanation:
We have a system of equations, so we can start with the second equation:

And move y to the other side to isolate x:

Now we can replace x into the first equation:

Notice that we can cancel out the y squared terms:

Now we just need to find x by replacing y into the second equation:

And finally, add them:

Hope this helps.
20. I’m in class so I can’t explain it but yeah
Answer:
Step-by-step explanation:
Just go to were the line intercepts the y axis so -2 and rise over run so 2 up and 2 over but its negative so C should be correct.