Which equation represents a linear function? a) y(x-1)=9
b) y-5=x(-x+2)
c) y(y-1)=x+25
d) y-5=x-20

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.