A lorry travelled 84 km between two towns. The first 60 km of road was untarred and the
average speed over this part was
30 km/h. If the average speed for the whole
journey was 36 km/h, calculate the average
speed over the good part of the road.​

it is true

step-by-step explanation:

all the combinations add up i used   calculator

c ) y = 2.5 x - 26.25

your answer is b.

step-by-step explanation:

the 2 points are: (3,1) and (6,6)

first, let's find the slope:

(6-1)/(6-3) = 5/3

then let's plug this into the point-slope formula:

y - 1 = 5/3(x - 3)

this is your answer! the below is just the simplified form.

y - 1 = 5/3x - 5

y = 5/3x - 4