# Math Help - Ordered pair

1. ## Ordered pair

Can anyone tell me if the ordered pair (x,y) = (5.8,2.0) is a solution to the equation y = 4x - 21.2

I would appreciate it if someone show me the best way to make this determination.

2. Originally Posted by YamahaR62002
Can anyone tell me if the ordered pair (x,y) = (5.8,2.0) is a solution to the equation y = 4x - 21.2

I would appreciate it if someone show me the best way to make this determination.
substitute in 5.8 for x and 2.0 for y ... if the equation is true after the substitution, then the point is a valid solution.

3. This is what I got:

2 = 4(5.8) - 21.2
2 = 23.2 - 21.2
2 = 2

So the answer would be: 2 is the ordered pair is a solution to the equation. Am I saying it right?

4. Originally Posted by YamahaR62002
This is what I got:

2 = 4(5.8) - 21.2
2 = 23.2 - 21.2
2 = 2

So the answer would be: 2 is the ordered pair is a solution to the equation. Am I saying it right?
not quite ...

the ordered pair (5.8 , 2.0) is a solution to the equation y = 4x - 21.2

the end equation 2 = 2 showed that the ordered pair (5.8 , 2.0) is a solution.

5. Thank you very much. Aside from math, if I wanted to donate, where would the funds go, to you personally or Math Help Forum?

6. Originally Posted by YamahaR62002
Thank you very much. Aside from math, if I wanted to donate, where would the funds go, to you personally or Math Help Forum?
I receive no monetary compensation ... I do this because mathematics is a big part of my life.

any donation goes entirely to MHF, not to any individual.

7. Hi Skeeter-

Could you just show me how to proceed forward with attached screenshot.

Please put me on the right track.

Thanks!

8. Hi there.

The first value of the ordered pair is the x value, and the second is the y value. So to complete the ordered pairs in those questions you just need to replace the x in the equation with the value you are given, then solve this to find the y value.

For the first one:

$y=\frac{4}{5}x+3$

so

$y=\frac{4}{5}\left ( 5 \right ) +3$

$y=4+3$

$y=7$

So the ordered pair would be $\left ( 5, \ 7\right )$

Are you able to do the other ones now?