Question

I NEED HELP! will give brainliest, please show your work
Philip made a total of 9 bracelets and necklaces from 120 inches of cord.
He used 8 inches of cord for each bracelet and 20 inches of cord for each necklace.
Use matrices to find the number of bracelets and the number of necklaces that Philip made.
number of bracelets=
number of necklaces=

Answer 1

Answer:

number of bracelets= 5

number of necklaces= 4

Step-by-step explanation:

* I don't know how to show a matrix with a keyboard so I'm just going to do two lines of brackets to represent the matrix.

b=bracelets

n=necklaces

[8   20  | 120]

[b   n    |  9   ]

You should put this into a graphing calculator:

[8   20  | 120]

[1     1    |  9   ]

Then use reduced row echelon form which equals:

[1   0   |   5]

[0   1   |   4]

The top line being the number of bracelets and the bottom line being the number of necklaces