Ask Your Question
0

Simultaneous Linear Equations Help [closed]

asked 2014-07-17 15:18:52 -0500

Iamastudent gravatar image

updated 2015-01-13 14:18:27 -0500

FrédéricC gravatar image

If (5,k) is a solution of the equation 2x+y-7=0, find the value of k.

There is no k in the equation. I am not understanding where k came from. Please help me understand.

edit retag flag offensive reopen merge delete

Closed for the following reason question is off-topic or not relevant by slelievre
close date 2014-07-18 20:18:56.026641

1 answer

Sort by » oldest newest most voted
0

answered 2014-07-18 17:17:00 -0500

Gregory Bard gravatar image

updated 2014-07-18 17:17:25 -0500

The author of this question intends for you to plug 5 in for x and k in for y. If you do this, you will obtain

2(5) + k - 7 = 0

10 + k - 7 = 0

3 + k = 0

k = -3

We can check our work by confirming that (5, -3) is a solution to 2x + y - 7 = 0.

2(5) + (-3) - 7 = 10 - 3 - 7 = 7 - 7 = 0.

edit flag offensive delete link more

Question Tools

1 follower

Stats

Asked: 2014-07-17 15:18:52 -0500

Seen: 68 times

Last updated: Jul 18 '14