The cab ride for the 3.8 mile trip is $8.4 .
What is the slope of a straight line?
Slope tells how vertical a line is.
The more the slope is, the more the line is vertical. When slope is zero, the line is horizontal.
To find the slope, we take the ratio of how much the line's height increases as we go forward or backward on the horizontal axis.
the points are (3, 7.90) and (9, 18.70)
y = mx + b
m = y2-y1/x2-x1
m = (18.70 - 7.90)/(9-3)
m = 10.8/6
m = 1.8
y = 1.8x + b
Put the values of x and y to find b ;
y = 1.8x + b
18.70 = 1.8(9) + b
10.5=8.75 + b
b=1.75
The equation of the line is y = 1.8x + 1.75
y=(1.8 X 3.8) + 1.75
y=6.65+1.75
y=8.4
Thus, The cab ride for the 3.8 mile trip is $8.4 .
The complete question is
A 3-mi cab ride cost $7.90. A 9-mi cab ride cost $18.70. How much does a 3.8-mi cab ride cost?
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