Answer:

Explanation:
For this graph we use function f(x) = kx or y = kx
In this case we have to find k (the slope) so we choose the point through which the line passes. For example point: (2;5)
2 is x and 5 is y
Now we have to put all the numbers to function and solve k.
y = kx
5 = k2
k = 5/2