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Choose the ordered pair that is a solution to the system of equations.

-x + y = 12
x + 2y = 3

a. (7, 5)
b. (5, -7)
c. (-7, 5)
d. (-7, -5)
e. none of the above

Please select the correct answer and type it in the box

2006-08-24 10:05:16 · 7 answers · asked by Anonymous in Science & Mathematics Mathematics

7 answers

Did you even try to figure this out?

answer is C, by inspection

2006-08-24 10:06:54 · answer #1 · answered by Bors 4 · 1 0

-x + y = 12
x + 2y = 3

3y = 15
y = 5

-x + 5 = 12
-x = 7
x = -7

ANS : (5,-7)

2006-08-24 20:24:23 · answer #2 · answered by Sherman81 6 · 0 0

The answer is c


Substitute all your x values for x, and solve for y. If they match, the solution works.


You can also solve using substitution, addition, and Gauss-Jordan elimination.

2006-08-24 17:08:35 · answer #3 · answered by mthtchr05 5 · 0 0

It is E because (7,5)=-2, (5,-7)=-12, (-7,5)=2, and (-7,-5)=-2

2006-08-27 04:25:13 · answer #4 · answered by babybear330682000 3 · 0 0

plug them in and see what you get.

e.g. for (a): -(7)+5 = -2 which is not 12, so (a) is wrong.

2006-08-24 17:07:07 · answer #5 · answered by Anonymous · 0 0

e: none of the above

crap... C IS right. I was in a hurry. My bad.

2006-08-24 17:11:37 · answer #6 · answered by Paul 7 · 0 0

add them side by side
3y=15
y=5
if y=5 then x=-7

c is true (-7,5)

2006-08-24 17:08:12 · answer #7 · answered by iyiogrenci 6 · 0 0

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