Question

15 postcards and 10 envelopes = $1.7 envelope is 0.02 cents more expensive than postcard

Answer 1

post cards cost .06 each and envelopes cost .08 each.

Explanation:

Let p = the cost of the post cards

Let e = the cost of the envelopes

15p + 10e = 1.70

e = p + .02 Substitute p + .02 for e in the first equation

15p + 10(p + .02) = 1.70 Distribute the 10

15p + 10p + .2 = 1.70 Combine like terms

25p + .2 = 1.70 Subtract .2 from both sides

25p = 1.50 Divide both sides by 25

p = .06

Post cards cost .06 each.

Envelopes cost .08 each