Question

how can i tell if -3x+5=4 is linear?

Answer 1

This is line which is parallel to y-axis.

Answer 2

solve it, you wil get a value for x.
the line will cut the x-axis at that point.

Answer 3

A linear function is of order 1,read here: http://en.wikipedia.org/wiki/Linear_function

Answer 4

a polynomial in which the highest power of the variable is 1 is called a linear variable..

here highest power of x is 1, so it is linear....