IF Y VARIES DIRECTLY AS X, AND Y=3 WHEN X=10, FIND Y WHEN X=40

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Hi Maria -These are proportion problems.  First you need to set up the initial equation:y varies directly as x"directly" is just a fancy way of saying that the proportionality constant k goes in the numerator, so we have:y = kx, so now let's plug in the values and solve for k:3 = k(10), solving for k it equals 3/10 or 0.3y = 0.3xNow, just plug in x = 40 into this equation.Hope that helps

y = 0.3x x = 40 all you have to do now isplug them into the equation