to get the equation of any straight line, we simply need two points off of it, let's use the ones in the picture below.

Y - y₁ = m(x - x₁)
y - 3 = -6(x - 0)
y - 3 = -6(x) + 6(0)
y - 3 = -6x + 0
+ 3 + 3
y = -6x + 3
It would be the bus goes 75 miles per hour while the car is going 95 miles per hour
Answer:
$6.50
Step-by-step explanation:
SET UP A SYSTEM OF EQUATIONS WHERE SANDWHICHES IS REPRESENTED BY S AND DRINKS BY D:
6S+4D = 53
4S+6D=47
ADD THEM TOGETHER
10S+10D=100
SOLVE FOR D
10D = 100 - 10S
D = 10-S
SUBSTITUTE THAT VALUE INTO ONE OF THE ORIGINAL EQUATIONS
4S + 6(10-S) = 47
4S + 60 - 6S = 47
COMBINE LIKE TERMS
-2S + 60 = 47
SUBTRACT 60 FROM BOTH SIDES
-2S = -13
DIVIDE BY -2
S = 13/2
S = $6.50