Answer
Equation: y=5x
y=50 when x=10
Work Step by Step
Since we know that y-varies directly with x, we can plug in the values for y and x and solve for k
5=k(1) (Divide both sides by 1)
5=k
So plug k in for the general form of a direct variation (y=kx):
y=5x
Now in order to find the value of y when x=10, plug this value of x into the equation above:
y=5(10)
y=50
