Answer:
first answer - you plot 'b' [on the y-axis] first, then use the slope m = c/d to go d units right and then c units up (positive 'c') or down (negative 'c')
Explanation:
plot 'b' [on the y-axis] first, then use the slope m = c/d to go d units right and c units up (positive 'a') or down (negative 'a')
It has to be the first answer (in spite of the typo here), because all the others are wrong