Answer:
salad costs £1
Explanation:
let b be the cost of a baguette and s the cost of a salad.
set up 2 simultaneous equations from the given information.
5b + 2s = 12 → (1)
9b + 2s = 20 → (2)
subtract (1) from (2) term by term to eliminate s
(9b - 5b) + (2s - 2s) = 20 - 12
4b + 0 = 8 ( divide both sides by 4 )
b = 2
substitute b = 2 into either of the 2 equations and solve for s
substituting into (1)
5(2) + 2s = 12
10 + 2s = 12 ( subtract 10 from both sides )
2s = 2 ( divide both sides by 2 )
s = 1
the cost of one salad is £1