2) a student uses the substitution method to solve the system of equations below algebraically.

x = 4y + 5
x = 3y - 2

which equivalent equation could be used?
y = 3(4y + 5) - 2
x = 3(4y + 5) - 2
x = 4(3y - 2) + 5
4y + 5 = 3y - 2

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?