HermioneGWeasley HermioneGWeasley

05-05-2017
Mathematics

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X+7y=24
X-9y=-24
Work needed for substitution method!!

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Gruffasoph Gruffasoph

05-05-2017

You can use a simultaneous equation - x + 7y=24 minus x-9y= -24 you end up with 16y = 48
Divide 48 by 16 and you get 3 is equal to y. Now put three into an equation eg, x + 21 = 24 it is now obvious that x = 3 as well as y = 3

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