<h2>
Hello!</h2>
The answer is: 
<h2>
Why?</h2>
Since we don't have the function equation, but we have the graphic, we can use it to know what value of x makes the function equal to 0.
Finding what values of x does
means that we should find where the function intercepts the x-axis.
From the graphic, we can see that the functions intercepts the x-axis at 
Have a nice day!
By multiplying both sides of an equation by a number, you can eliminate all decimals and fractions, so the answer is C.
y = 20x
The graph passes through the origin , hence is of form
y = mx ( m is the slope )
to calculate m use the gradient formula
m = (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁) = (2, 40) and (x₂, y₂) = (4, 80) ← 2 points on the graph
m =
=
= 20
y = 20x