Posted by vero on Wednesday, January 7, 2009 at 5:01pm.
Pick any number that will multiply by one of the equations to give the same number as in the other equation. For example, if we multiply equation 1 by 2 we would have
-10x-8y=-22. Why did I pick 2 as a multiplier. Because it gives me -10x and 10x agrees with the x in equation 2 (the sign is different but that's ok). Then adding equation 1 to equation 2 will eliminate x because -10x+10x = 0x. OK?
-5x-4y=-11
10x=-6-y
line them up - something*x + something*y = something
-5 x - 4 y = -11
10 x + 1 y = -6
we could now multiply the first equation by 2 to make the absolute value of the x coefficient 10 for both -then eliminate x by adding them
or
we could multiply the second by 4 to make the absolute value of the y coefficient 4 for both. then eliminate y by subracting them.
Lets do the second and eliminate y:
-5 x - 4 y = -11
40 x + 4 y = -24
------------------ now add
+35 x +0 y = -35
so
x = 35/35 = -1 now go back and use either equation to find y
y = -10(-1) -6
y = 4
oo......thanks to both of you so much
iwnt hlp wth reduction formulas
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