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Johnny's Substitution Problem
1. Johnny’s Substitution
Johnny has backstage tickets to a Coldplay Method:
1. Establish:
concert. When he goes backstage to the band, C=f+2
he doesn’t want to go empty-handed. So he M = 2c
goes to the store before the concert and buys 4 2. Write:
4c + 4f + m = 52
flowers, 4 cookies, and 1 microphone. A cookie 3. Substitute
is 2 CHF more than a cookie, and a microphone M = 2(f + 2)
4(f + 2) + 4f + 2(f + 2)
is twice as much as the cookie. He spends 52
4. Distributive prop.:
CHF. 4f + 8 + 4f + 2f + 4
5. Simplify:
Find: 10f + 12 = 52
-12 -12
How much each item is worth. 10f = 40
:10 :10
F=4
C=6
M = 12