SOLUTION: Five notebooks and a pack of pencils costs $7. Two notebooks and 2 packs of pencils cost $4. How much does a notebook cost

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Question 1081575: Five notebooks and a pack of pencils costs $7. Two notebooks and 2 packs of pencils cost $4. How much does a notebook cost
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
(1) 5N+P = 7
(2) 2N+2P = 4
(1) ==> P = 7-5N
Subs into (2):
2N + 2(7-5N) = 4
2N + 14 - 10N = 4
-8N = -10
highlight%28+N+=+1.25%29+
—
Check: N=1.25 —> P=0.75
(1) 5(1.25) + 0.75 = 6.25 +0.75 = 7 (ok)
(2) 2(1.25) + 2(0.75) = 2.5 + 1.5 = 4 (ok)