The graph below describes the journey of a bus between two stops. 8+
a) Work out the
6
acceleration, in m/s?,
in the first 20 s.
b)
D
)
S
Velocity in m/s)
b) Work out the distance
between the two stops.
2
0
0
20
40
60 80 100 120 140 160 180
Time (t in seconds)
c) Work out the average
speed of the bus during
the journey

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

15.36 per mile

but forgot to round

i am pretty sure