slope = (y2-y1)/(x2-x1)
the first slope is 0 (horizontal line)
second slope is undefined (vertical line)
Step-by-step explanation:
115 = 5x + 15
115 - 15 = 5x
100 = 5x
20 = x
C. 4x + y = 21
4(3) + 9 = 21
12 + 9 = 21
21 = 21
Last answer for the first question and in not sure about the second one