SOLUTION: Judy makes banana bread and nut bread to sell at a bazaar. A loaf of banana bread requires 2 cups of flour and 2 eggs. A loaf of nut bread takes 3 cups of flour and 1 egg. Judy

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Question 926797: Judy makes banana bread and nut bread to sell at a bazaar. A loaf of banana bread requires 2 cups of flour and 2 eggs. A loaf of nut bread takes 3 cups of flour and 1 egg. Judy has 12 cups of flour and 8 eggs on hand. She makes $2 profit per loaf of banana bread and $2 per loaf of nut bread. To maximize profits, how many loaves of each type should she bake?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of loaves of
banana bread she should make
Let +y+ = number of loaves of
nut bread she should make
--------------------------
Let +P+ = profit
+P+=+2x+%2B+2y+
------------------
Equation for flour used:
+2x+%2B+3y+%3C=+12+
Equation for eggs used:
+2x+%2B+y+%3C=+8+
-----------------
Plot the constraints ( limits on flour and eggs )
+3y+%3C=+-2x+%2B+12+
+y+%3C=+%28-2%2F3%29%2Ax+%2B+4+
and
+y+%3C=+-2x+%2B+8+
+graph%28+400%2C+400%2C+-5%2C+15%2C+-5%2C+15%2C+%28-2%2F3%29%2Ax+%2B+4%2C+-2x+%2B+8++%29+
The possible vertex solutions look like:
( 0,4 )
+P+=+2%2A0+%2B+2%2A4+
+P+=+8+
and
( 4,0 )
+P+=+2%2A4+%2B2%2A0+
+P+=+8+
and
( 3,2 )
+P+=+2%2A3+%2B+2%2A2+
+P+=+10+
------------------
It looks like she should make 3
loaves of banana bread
and 2 loaves of nut bread
-----------------------
-----------------------
check:
suppose she made 2 loaves of banana bread
and 3 loaves of nut bread ( 2,3 )
+P+=+2%2A2+%2B+2%2A3+
+P+=+10+ ( same profit )
but
+2x+%2B+3y+%3C=+12+
+2%2A2+%2B+3%2A3+%3C=+12+
+13+%3C=+12+ not true
-----------------------
suppose she made 4 loaves of banana bread
and 1 loaf of nut bread ( 4,1 )
+P+=+2%2A4+%2B+2%2A1+
+P+=+10+ ( same profit )
but:
+2x+%2B+3y+%3C=+12+
+2%2A4+%2B+3%2A1+%3C=+12+
+11+%3C=+12+ OK
but
+2x+%2B+y+%3C=+8+
+2%2A4+%2B+1+%3C=+8+
+8+%2B+1+%3C=+8+ not true
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Hope this helps