Re: Just not understanding X,Y variables

D

drr61

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Sep 6, 2005
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Re: Just not understanding X,Y variables

x + y = 4

x - y = 5

How do I solve this? This particular problem is to be solved by substitution.
Please explain!

Thanks,

Drr
 
Re: Just not understanding X,Y variables

drr61 said:
x + y = 4
x - y = 5
solved by substitution.
Click to expand...
Solve one for one variable and substitute into the other.

Solve one for one
x - y = 5 ==> x = y + 5

Substitute into the other
x + y = 4
(y+5) + y = 4

You're not quite done...
 
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