Thursday, April 3, 2014

How do I solve this math problem ?Mrs. Crews bought 4 pencils and 3 pens for $5.60. Miss Houston bought 2 pencils and 3 pens of the same kind for...

Let the price of the pen be x and the price of pencils be
y.


The cost of 4 pencils and 3 pens is
5.6


==> 4y + 3x = 5.6
.............(1)


Also, the cost of 2 pencils and 3 pens is
4.6


==> 2y + 3x = 4.6
...............(2)


We will solve the system using the
elimination method.


We will subtract (2) from
(1).


==> 2y =
1


==> y= 1/2 =
0.5


==> Now we will calculate
x.


==> 2y + 3x =
4.6


==> 2(0.5) + 3x =
4.6


==> 3x = 4.6 - 1 =
3.6


==> x = 3.6 /3 =
1.2


Then the price of the pen is $1.20 and
the price of the pencil is $0.50

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