Given y = wx2 and y is not 0. If the values of x and w are each doubled, then the value of y is multiplied by:
A. 1
B. 2
C. 4
D. 6
E. 8
Given y = wx2 and y is not 0. Since the values of x and w are each doubled, replace w with 2w and x with 2x in the original equation:
ynew = (2w)(2x)2
= (2w)(4x2)
= 8(wx2)
= 8y.
Therefore the original value of y is multiplied by 8.