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if you have one equation that gives you x or y
use substitution
x+3y=18
x= 18-3y
substitute (18-3y) for x in the other equation
if you have coefficients that will not 'reduce'
use elimination
2x+3y= -3
5x-4y=9
watch for equations that will reduce
2x+4y= -8
divide through by 2
x+2y= -4
x= -4-2y
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