well, first of you know that the "rise" of the slope will be "2", because the "y" value is 2 more than the other ( 5 - 3 = 2 ). now, figure out the "run". 1 - (-5) = 6
now we already know that the slope is 2/6. that's is a start. and the y intercept is 4.65.
y = 2/6x + 4.65