Answer:
4
Explanation:
The question is asking us to find what number multiplied by x, the input, will give us y, the output.
We can see that the first input is 5, and the output is 20, so we can set up an equation:
20=_5
_=4
So, the equation would represent:
y=4x
We can check our work with the second set of inputs and outputs:
60=(4)15, which is true, so 4 is the right number.
Hope this helps!