Problema Solution
If y varies directly with x and if y = 20 when x=4, what is y when x=10?
Answer provided by our tutors
y varies directly with x if there is a constant k such that:
y = kx or y/x = constant
Now we can write:
20 : 4 = y : 10
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click here to see the equation solved for y
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y = 50
When x = 10, y = 50.