Question

when is y directly proportional to x?(one answer) y=x² y=5x every time x doubles y doubles every time x increases by 1 y increases by 1 y=2x-3 y=12/x

Answer 1

See below.

Explanation:

The question is poorly formatted. I'll interpret, and answer, as per below.

when is y directly proportional to x?

(one answer)

a) y=x²

b) y=5x

c) every time x doubles y doubles

d) every time x increases by 1 y increases by 1

e) y=2x-3 y=12/x

a) y=x² No. Y goes by by a squared power

b) y=5x Yes. Y increases by a constant factor (5) per increase in x

c) every time x doubles y doubles Yes. Proportional increase.

d) every time x increases by 1 y increases by 1 Yes.

e) y=2x-3 Yes

f) y=12/x No. y decreases by 1/x