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Sven is thinking of tow numbers the sum is 12. the difference is 4
sum means add difference menad subtract 2 ways to solve, 1, eliminate x+y=12 x-y=4 so we can add the 2 equations x+x+y-y=12+4 2x=16 divide 8 x=8 subsitute 8+y=12 subtract 8 y=4
the other ways is subsiute x+y=12 x-y=4
x-y=4 add y to both sides x=4+y subsitute 4+y for x 4+y+y=12 subtract 4 2y=8 divide 2 y=4 subsitute x+4=12 subtract 4 x=8
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