If You Answer These Right you will get 10points!!!!!!!MATH?

0 ⤊

If You Answer These Right you will get 10points!!!!!!!MATH?

x-y=0
12x-5y=-21

p+q=4
4p+q=1

m+2n=1
5m+3n=-23

SHOW YOUR WORK!!!!!!!!!!

2007-08-22 13:46:03 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3 answers

1. (-3,-3)

2. (-1,5)

3. (-7,4)

2007-08-22 13:54:44 · answer #1 · answered by mystery gurl 1 · 0⤊ 0⤋

x-y=0
12x-5y=-21

multiply 1st with 5

5x-5y=0
12x-5y=-21
- + +
------------

-7x = -21
x=3
y=3

p+q=4
4p+q=1
- - -
-----------
-3p=3
p=-3
q=7

m+2n=1
5m+3n=-23

5m+10n=5
5m+3n=-23
- - +
------------
7n=28
n=4

m=-7

here you go :)

2007-08-22 13:58:35 · answer #2 · answered by buggy 2 · 0⤊ 0⤋

Which variable are you supposed to solve for in each case?

2007-08-22 13:49:55 · answer #3 · answered by Lady Geologist 7 · 0⤊ 0⤋