A group of up to 40 people are going to a trip to Washington DC. Some will travel in a van that holds 12 people, and the rest will buy train tickets. Write an inequality that can be used to find the number of train tickets that the group will need.

You are told up to 40 people are going and that the van holds 12.

40-12 = 28

So up to 28 people will need to buy train tickets.

Let n be the number of people buying train tickets and x is the total number of people going

N <= (x-12)

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system