The answer is £64.89.
Step by Step:
Take the original price multiplied by 0.03 ( the percent of a booking fee ) and add those amounts together.
Equation: 63 + 1.89 = 64.89
The y-intercept (where x = 0) of the equation is at -20.
For every 60 the x runs, the y falls by -10. Use rise over run to determine the slope of the equation.

Slope-intercept form is determined by the following equation:

m is your slope, and b is your y-intercept.
Plug the slope and y-intercept into the equation.
Answer:
x = 2y
x - 8 = y + 6
replace x by 2y in the second equation
2y - 8 = y + 6
y - 8 = 6
y = 14
x = 2*14 = 28
Kendra had $28 and Kareem had $14.
Answer:
-4x-y=24= - 4 · (-7) - 4 = 24