Question

Which function is a linear function?

1 − 3x2 = -y
y + 7 = 5x
x3 + 4 = y
9(x2 − y) = 3
y − x3 = 8

Answer 1

a linear function is a function which has 1st power:
common forms are
y=mx+b
Ax+By=c
y-y_1=m*(x-x_1)

linear functions are lines

Answer 2

i still don't get it