Question

Is this equation linear or nonlinear? 5xy + 4 = 9

Answer 1

It is definitely linear

Answer 2

5xy+4=9

5xy=5

xy=1

y=1/x

So this is of the form kx^(-1), this is not linear as the rate of change is not constant...only kx^1 will have a constant rate of change and be linear.

If you graph it you will see that it is exponential....definitely not a straight line :P