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March 31, 2015

March 31, 2015

Posted by **<3Medic+Droid<3** on Sunday, January 25, 2009 at 10:36am.

a)Write an equation for the total # of items sold.

b)Write and equation for the total cost of the items.

c) The equations form a system. Solve the system to find the # of corn dogs and burritos sold.

~my answers~

a) c+b=600

b)$.35c+$.75b=$360

c) c=225

b=375

Firstly, I find it weird to sell corn dogs and burritos together. Still, I would love to know if I got it right.

Oh and what is a matrix? I have to make one for the system, but i can't even remember what they are! (how the heckz did i pass my finals?!?)

Anyway, any help would be very much appreciated. Thanks!

- 8th Grade Algebra Answer Check -
**drwls**, Sunday, January 25, 2009 at 11:19amYour answers are correct.

A matrix is a set of rows and columns of numbers. In this case the numbers of the matrix would be the coefficients of c and b in the two equations, or the coefficients of one variable and the sum. They can be used to solve systems of linear equations such as these. For example

c =

|600 1|

|360 .75|

__________

|1 1|

|.35 .75|

= (450-360)/(.75-.35) = 90/.4 = 225

- 8th Grade Algebra Answer Check -
**<3Medic+Droid<3**, Sunday, January 25, 2009 at 11:22amThank you so much!

- math -
**christeria**, Wednesday, February 11, 2009 at 10:42amc=

600 1

360.75

1 1

.35.75

= 450-360

.75-.35=90

.4=225

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