Average speed is given by [Total Distance] ÷ [Total Time]
Average speed =

km/hour
y = - 3
the equation of a horizontal line, parallel to the x- axis is y = c where c is the value of the y- coordinate the line passes through
Line passes through ( - 7, - 3) → y- coordinate is - 3
equation of line is y = - 3
Answer:
answer is x=14.4.......,......