Which equation represents a proportional relationship?

y=−5(x+1)

y=−x

y=15x

y = 5x + 1

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which equation represents a proportional relationship?

y=−5(x+1)

y=−x

y=15x

y = 5x + 1

which equation represents a proportional relationship?

y=−5(x+1)

y=−x

y=15x

y = 5x + 1

To figure out if an equation is proportional, substitute zero for x. If y then equals zero, then the equation represents a proportional relationship.

Going by this, we see that when x is substituted for zero, the only option that makes y equal the same is:

y= 15x

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