The third one correctly eliminates the y-value from the equation.
This would be:

Using common denominator of 6:

They should use

of their time.
Answer:
10 in
Step-by-step explanation:
12 - 5 < third side < 12 + 5
7 < third side < 17
Answer:
2
Step-by-step explanation:
y2-y1 = 5-1 =4
x2-x1= 2-0 =2
4/2=2