The answer depends on x and y. They are not defined for this question.
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X and Y are directly propotinal.If one is varing other is varing too.
Yes. Directly and 8 times as fast.
Example: 2/3 y = x this simple example means this: you are to find the fraction that multiplies to it and equal one. (of course, just flip it around) then move THAT behind x. It vary directly if it is the same as this - y=kx Tip: subtraction and addition automatically says "no , this does not vary directly
y = kx k = y/x = 21/-5 = - 21/5
-8