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We have to add first eq to second eq. -2x+y+2x+4y=-8+18 5y=10 /:5 y=2 Now we can backsubstitute 2x+4*2=18 2x+8=18 /-8 2x=18-8 2x=10 /:2 x=5 Finally we obtain result x=5 y=2
elimitation method basically eliminate one of the terms completely we see that there is a -2x and a 2x in the 2 equations so just add them together 2x-2x+4y+y=18-8 5y=10 divide both sides by 5 y=2
subsitute -2x+2=-8 subtract 2 form boht sides -2x=-10 divide both sides by 2 -x=5 multiply -1 x=5
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