please help, I don’t get it

Answer:
y = 4/5 x
Step-by-step explanation:
The two points on the line are (0, 0) and (5, 4). Find the slope:
m = (y₂ − y₁) / (x₂ − x₁)
m = (4 − 0) / (5 − 0)
m = 4/5
The y-intercept is 0, so the equation of the line is:
y = 4/5 x