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Systems,
2 x 2
in this case, are when you have 2
equations and 2
unknowns (letters).
Here's an example:
The goal is to find an
x
guy and a y
guy that work in both equations.
In this chapter, I'll show you
three different ways to solve these.
The first method is graphing.
This is a cool method to start with since it lets you see what's
going on.
We've got two equations -- and
they are equations of lines. Let's graph them both on the same
axes and see what we get.
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Hey, the two lines intersect at
the point
( 2 ,
1 ) .
This means that
(
2 , 1
)
is a point in BOTH lines...
So,
x =
2
and y
= 1
will work in the equations!
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| So, the answer is |
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Checking your answers,
like we did at the end there, is a really good idea... and something
you should always do on a test! We're going to do it on every
single problem we do!
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