Question

Richard bought 3 slices of cheese pizza and 2 sodas for $8.75. Jordan bought 2 slices of cheese pizza and 4 sodas for $8.50. How much would an order of 1 slice of cheese pizza and 3 sodas cost?
A. $3.25
B. $5.25
C. $7.75
D. $7.25

Answer 1

Let
x------------> the cost of one slices of cheese pizza
y------------> the cost of one soda

we know that
3x+2y=8.75
2x+4y=8.50

using a graph tool
see the attached figure

the solution is
x=2.25
y=1
so
x+3y-----> 2.25+3*1------> 5.25

the answer is 
the option B) $5.25