ANSWER

and

EXPLANATION
The slope of a straight line graph is a number that tells us how steep it is.
A larger number means a steeper slope.
For all the options, the equation is already in the slope intercept form,

where m is the slope.
For option A,

This means that,


For option B,



For option C,



For option D,



The equations whose slope has the least absolute values has the least steep.
Therefore equations A and B has the least steep graph.