September 2018 0 9 Report

Rozwiąż uklad równań

ta klamerka {2x+5y=25

jest duża {4x+3y=15

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Odpowiedzi

kokos123
kokos123

x=12,5-2,5y
4(12,5-2,5y)+3y=15

50-7y=15
35=7y

y=5

x=12.5-2,5*5
x=12,5-12,5

x=0

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\left \{ {{2x+5y=25} \atop {4x+3y=15}} \right \ \\ \left \{ {{2x+5y=25/*(-2)} \atop {4x+3y=15}} \right\ \\ \left \{ {{-4x-10y=-50} \atop {4x+3y=15}}\right\ \\ __________\\ -7y=-35\ \\ y=5\\ 2x+25=25\\ x=0 \\


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