Answer:
21 yards
Step-by-step explanation:
the answer is 6
slope = m
y = mx + c
m = 6
for apex the answer is -6
x = 9
y = 3
2x + 2y = 24 is the same as x + y = 12
using substitution, x = 12-y
12 - y = 3y
12 = 4y
x = 3(3)