Answer:
Let's make sandwich "s" and tea "t."
Make an equation with the variables.
a. 1s + 1t = 2.10
b. 2s +1t = 3.70
Then, do 3.70-2.10, to find the cost of a sandwich. It equals 1.60.
Then, do 2.10-1.60 to find the cost of a cup of tea, which is 0.50.
SO: The cost of a cup of tea is £0.50.
The cost of a sandwich is £2.10.
Hope this helps!
Answer:t= 0.50
Step-by-step explanation:
s= sandwich cost
t= tea cost
s+t= 2.10
2s+t = 3.70
Rewrite first equation as s= 2.10- t
Plug it into second equation.
2(2.10-t) +t= 3.70
4.20-2t+ t= 3.70 subtract 4.20 from both sides
-2t+t= 3.70-4.20 combine like terms
-t= -0.50 negative cancel out so
t = 0.50
