Two quantities, x and y, are directly proportional. If x is halved, what happens to y?

A.It is doubled.

B.It is squared.

C.It is multiplied by 12.

D.It depends on the starting value of x.

If x and y are directly proportional, that means that every change in x will result in same change in y. The change should be multiplicative/proportional, not additional. You can put it in this equation

y= kx

where k is a constant.

If the x is halved(x2= 0.5x1), the y will change into

y2/y1= kx2/ k1x1 = 0.5x1/ x1= 0.5

The value of y will be half of its value before. In another word, it will be multiplied by 1/2

Two quantities, x and y, are directly proportional. If x is halved, what happens to y? A.It is doubled. B.It is squared. C.It is multiplied by 12. D.It depends on the starting value of x.

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Two quantities, x and y, are directly proportional. If x is halved, what happens to y?

A.It is doubled.

B.It is squared.

C.It is multiplied by 12.

D.It depends on the starting value of x.