Find the y intercept of a function

And the symmetry point

Using elimination, what is -4x+2y=-12 4x+8y=-24

Acable company claims that the average household pays $78 a month for a basic cable plan, but it could differ by as much as $20. write an absolute value inequality to determine the range of basic cable plan costs with this cable company. a. |x − 78| ≥ 20 b. |x − 20| ≥ 78 c. |x − 20| ≤ 78 d. |x − 78| ≤ 20

Can someone answer and tell me how to do this (will mark brainliest)