I Need Help With Math

Question

The cost of 3 tacos and 1 soda is $7. The cost

of 4 tacos and two sodas is $10. What is the cost of one taco and one soda?

Answer 1

3T + S = 7

4T + 2S =10

4T + 2(7-3T) = 10

4T +14 -6T =10

2T =14-10

T =4/2 = $2 for a taco

S = 7-3T = 7-6 = $1 for a soda