Rozwiąż równanie 3(x-y)+4(x+y)=15 -2x+3y=-1 daje NAJ!.... Question from @KosiamOleOrlowska

December 2018 2 6 Report

Rozwiąż równanie
3(x-y)+4(x+y)=15
-2x+3y=-1
daje NAJ!

ivon 3(x-y)+4(x+y)=15
-2x+3y=-1

3x-3y+4x+4y=15
-2x+3y= -1

7x+y=15/*(-3)
-2x+3y= -1

-21x-3y= -45
-2x+3y= -1
------------------
-21x-2x=-45-1
-23x=-46/:(-23)
x=2

-2x+3y= -1
-2*2+3y= -1
-4+3y= -1
3y= -1+4
3y=3/:3
y=1

x=2
y=1

3 votes Thanks 1

Havs $
\begin{cases} 3(x-y)+4(x+y)=15\\-2x+3y=-1\end{cases} \\ \\ \\ \begin{cases} 3x-3y+4x+4y=15\\-2x+3y=-1\end{cases} \\ \\ \\ \begin{cases} 7x+y=15|*(-3)\\-2x+3y=-1\end{cases} \\ \\ \\ \begin{cases} -21x-3y=-45\\-2x+3y=-1\end{cases} \\+--------- \\ -23x=-46 \\ x=2 \\ \\ \\ -2x+3y=-1 \\ -2*2+3y=-1 \\ 3y=-1+4 \\ 3y=3 \\ 
y=1 \\ \\ \begin{cases} x=2\\y=1\end{cases}$

1 votes Thanks 1

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