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Math HELP



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sealightbreeze

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Sorry if this is in the wrong section. I need help with my sisters math homework. Please help

Two numbers have a sum of 22. Their difference is 4. What are the two numbers?
 

sealightbreeze

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Thanks you. I was always very bad at math. Hey CursedRebellion, lay off ok? between 3 kids (ages 6, 9, and 11) I have a lot to do. I was never good at math. That's why I asked for help.
 

Savior of Dawn

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Guess and check could work.. But from the looks of it, it's a system of equations.

X+Y=22
X-Y=4

Convert to Slope-intercept
Y=-X+22
Y=X-4

Lines are Consistent and Independant (Meaning one solution)

Graph (Using two points, the Y intercepts (0,22) (0,-4) or Using a graphing calculator.

The point they cross, or the solution is (13,9) or 13 and 9.

But you won't reach that level until you're 15 or so. So, for now, guess and check.
 

Savior of Dawn

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Katattack said:
Whoa. That's way helpful. That beats the pants off guess and check.

I knew there must be a more logical way of doing it. Thanks, SoD. Even though you weren't meaning to help me. xD

Actually, that's the most basic way to solve the system of equation. I could delve in deeper using matrices and crap like that.. But there's no need to do that when you can solve it simply using a graph.

I would've posted a screenshot of the graph that I pulled up on an online graphing calculator, but I didn't think it would be worth it since it was obviously meant as a lower level problem. Still, I love systems of equations. The only part I hate about them is substitution, substitution is evil. I'll do anything but substitution. Cramer's rule is my favorite (Using matrices).

But, I'm blabbing on about it, so I'll just leave it be. : P
 
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