Multiply the second equation by 2 so that its 6x+4y=-30 then subtract 6x+y=-39 6x+4y=-30 = -3y=-69 divide by -3 to isolate the y then you get y=23 substitute the y value back into one of the equations to solve for x. 6x+23=-31 solve like you always do and you'll get your x Congratulations, you solved a problem.
if y is the total cost then the equation y = x +5 where x is the miles driven and $5 is the initial cost would accurately represent the cost of your cab ride.
