Question

Solve the following system of equations.

x + 3y - z = 2
x - 2y + 3z = 7
x + 2y - 5z = -21

Answer 1

this isnt possible

Answer 2

>.<

Answer 3

(2, 3, 5)

(-2, 3, 5)

(2, -3, 5)

(2, 3, -5)
these are the answer choices

Answer 4

http://www.wolframalpha.com/input/?i=solve {x+%2B+3y+-+z+%3D+2%2C+x+-+2y+%2B+3z+%3D+7%2C+x+%2B+2y+-+5z+%3D+-21}

Answer 5

When you have a multiple choice, start testing each choice until you get the one that works.
(2,3,5) does not satisfy the firs equation
x + 3y - z = 2
2+ 3(3)-5=6 is not equal to 2
You continue testing until you get the answer.

Answer 6

As you can see from wolframalpha (-2,3,5} satisfies the three equation and you are done.
Of course, you can solve the three equations by hand.

Answer 7

Two competing internet companies have recently restructured their payment plans. Quick Net requires a $10 activation fee and charges $55 per month for their basic plan. Speedy Net requires no activation fee and charges $57 per month for their basic plan. When will the two plans be equal in cost?

Answer 8

thanks for the help btw

Answer 9

gonna be up all night doing math... spent all day working... work again tomorrow.....exhausted

Answer 10

Post the problem as a new problem to not get people confused about which problem we are dealing with.