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Question

which of the following is an example of a proportional equation a. y= -1.4x b. y=x+1 c. 10.5x-5 d. none of the above

Answer 1

(a) is a proportional equation because y = -1.4x can be rearranged to say y/x = -1.4 and y/x is a ratio that is always the same (in this case -1.4). The value -1.4 is called the constant of proportionality.

Answer 2

a. y=-1.4x is a proportional equation. y and x are proportional if they can be expressed as y=kx where k is a constant number.