Question

If I sent five 2 oz. letters and three 3 oz. letters by first class mail that cost me $5.80. Sending three 2 oz. letters and five 3 oz. letters cost me $6.20 what would the cost be for one 2 oz. and one 3 oz. letter?

Answer 1

System of equations

Let 2 oz letters be represented as A
And let 3oz letters be represented as B

\[\large 5A + 3B = 5.80\]
\[\large 3A + 5B = 6.20\]
Once we solve for A and B in that system, we can use them to find out
\[\large A + B = ?\]

Answer 2

Good here? :)

Answer 3

thank you so much I got .65 for one and .85 for the other I appreciate your help