Question

What is the solution of the system?
2x – y = –7
4x – y = –4

Answer 1

So, can I teach you how to use wolfram alpha if you just want answers? It's faster and more accurate than asking people here.

Answer 2

1) Go to http://www.wolframalpha.com

Answer 3

2) Type this:
2x-7 = -7, 4x - y = -4

Answer 4

3) Press return

Answer 5

oh yeah cuz i went on there and they gave me the wrong answer
but thank you very much i appreciate it

Answer 6

What did you do? That's how I'm giving you the answers.

Answer 7

http://www.wolframalpha.com/input/?i=2x-7+%3D+-7%2C+4x+-+y+%3D+-4

Answer 8

You have to put a comma between the two equations

Answer 9

oh noes wolfram gives incorrect answers!!!

Answer 10

2x – y = –7 (1)
4x – y = –4 (2)

negate the second equation
-4x + y = 4 (3)

Add (1) and (3)
-2x + 0 = -3

=> x = 3/2

Substitute this in (1) to get y
3 - y = -7

=> -y = -10
=> y = 10