The answer is 12 because the linear equation is mx+b,where m is the slope and b is the y-intercept.
Answer:
and 
Step-by-step explanation:
If two equations are given, we can solve one of the equation in terms of single variable and put it in the other equation which will further give the value of x and y.
For the given equations:
Equation:1
Equation:2
Solving equation multiply equation 2 with 4 on both the sides
Equation 3
Subtracting Equation:3 from Equation:1

Putting value of 'y' in Equation:2 which will give the value of x

Average speed: distance traveled/elapsed time
= 75/30
= 2.5 meters per second.
Best of Luck!
Answer: I’m pretty sure is letter A