exam Maths Puzzle Numerical Ability

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I have no idea what this could be: y=2^x and y=log2x
It says to identify the graph that represents the corresponding function.
The lines are (1, -3) (0,0) (-5,1)
I really do HELP!!!!

Rewrite the equation as a function of x

y=-7x-9

thanks a lot
Heather