If it can be represented in y=mx+b form, then it is definitley linear....
the above equation is y=12x+22 so yes, it linear.... Its a freaking equation. If x is something and something, then it is y(As equations are). So if something is in an equation like above is definitley a proportional relationship.
examples of proportional relationships
y=(1)x(+0)
y=3x(+0)
Equations are always proportional. If you solve one and there is no solution(no logical relationship between x and y), then its not an equation
