clearly (0,5) is the y-intercept, so all we need is the slope
slope = (12-5)/(4-0) = 7/4
so y = (7/4)x + 5
b) good grief, another abuse of equations and variables.
Just do the question!
cost = 3.2($2.50) + $6.90
= $14.90
a)Write an equation for the line that passes through the points (0,5) and (4,12). Use any valid form of a linear line.
b)You are taking a Yellow Cab in St. Paul from Como Park to the State Capitol (a 3.2 mile trek). When you get in, you are charged $6.90 for the likely amount of time spent in the cab. They also charge $2.50 per mile. What will be your fare at the end, without tips? YOU MUST WRITE A LINEAR EQUATION THAT RELATES THE FARE TO THE DISTANCE TRAVELED, AND SOLVE THAT EQUATION.
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