Question

The number of years since Lena graduated

from middle school can be represented by the
equation y = a - 12, where y is the
number of years and a is her age. Is the
relationship between the number of years
since Lena graduated and her age
proportional or nonproportional?

Answer 1

No it’s not proportional. If you had a coefficient in front of the a it could have been proportional. But the addition or subtraction of a quantity leads it to be nonproportional