I need help I don’t understand

The answer is no.

Step-by-step explanation:

For something to be a function it cannot repeat an x. In this example, on the left side, the -1 goes to two numbers, so written out that means (-1,2) and (-1,-1). This means that the number set has two -1's which means it cannot be a function.

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x