Answer:
y = -9
Step-by-step explanation:
y2 - y1 / x2 - x1
-9 - (-9) / -3 - 1
0 / -4
y = 0 + b
-9 = b
A=a+b/2
A×2=a+b/2×2
A2=a+b
A2-a=a+b-a
A2-a=b
92.97
Hope this helped!
