nilai x dari persamaan kuadrat x2+ y2= 25 dan x2-y2=7 adalah
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2x+2y=25. (1)
2x-2y=7. (2)
adding (1) and (2) we get
2x+2x+2y-2y=25+7
4x=32
x=8
y=4.5
2x-2y=7. (2)
adding (1) and (2) we get
2x+2x+2y-2y=25+7
4x=32
x=8
y=4.5
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