One slice of pizza and one soda costs $1.99. three slices of pizza and two sodas cost $5.48. write a system of equations for the problem. which one of the equations would be apart of the system?

If you put it in algebraic terms, and pizza is p, soda is s
1p + 1s = 1.99
3p + 2s = 5.48
to find the cost individually you use simultaneous equations 
by multiplying the top equation by 2 you get 
2p + 2s = 3.98
and then you can say that 1p is 5.48-3.98 = 1.50
and if 1p = 1.50, 1s = 1.99-1.50=49