Two hot dogs and a soda cost $3.25. if three hot dogs and a soda cost $4.50 what is the cost of two sodas?

H-cost one hod dogs
s-cost one soda

2h + s = $3.25
3h+s = $4.50

(3h + s) - (2h + s) = 3h + s - 2h - s = h
h = $4.50 - $3.25 = $1.25

subtitute to 2h + s = $3.25

2($1.25) + s = $3.25
$2.50 + s = $3.25    |subtract $2.50 from both sides
s = $0.75

Cost of two sodas:
2s = 2($0.75) = $1.50