Answer: 40
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Explanation:
You haven't posted the full question, but I'm assuming you're looking for the proportionality constant k. If this assumption is correct, then you have the right idea, but instead of 1/40, you should have done 40/1 = 40.
This is because the point (x,y) = (1,40) is then used to compute the k value to be
k = y/x = 40/1 = 40
You could also use a point like (2,80) to get the same thing
k = y/x = 80/2 = 40
You can use any point on the blue line as long it's not the point (0,0). This is because dividing by zero is not allowed.
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Side note: The equation of this line is y = 40x. It is in the form y = mx+b with m = 40 as the slope and b = 0 as the y intercept.
