Linear-Quadraric Systems of Equations: Matching equations to graphs

Choose the formula that represents line 1 in the graph below:

$y=x^2-6x$

Which formula describes graph 2?

$y=4x-17$

Which formula represents line 1 in the graph below?

$y=x^2-6x+8$

Which formula represents line 2 in the graph below?

$y=-x+4$

Which formula represents line 2 shown in the graph below?

$y=-2x+5$

Choose the formula that describes graph 1:

$y=x^2-6x+8$