Odpowiedź:
x+2y=7 /*(-2)
2x-y=1
-2x-4y=-14
-----------------
-5y=-13 /:(-5)
y=13/5
y=2 3/5
x+2*13/5=7
x+26/5=7
x+5 1/5=7
x=7-5 1/5
x=1 4/5
Szczegółowe wyjaśnienie:
x+ 2y=7
x=7-2y
2•7-2y-y=1
14-y=1
-y=1-14
-y= -13 /: (-1)
y=13
x=7-2•13
x=7-26
x=-19
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Odpowiedź:
x+2y=7 /*(-2)
2x-y=1
-2x-4y=-14
2x-y=1
-----------------
-5y=-13 /:(-5)
y=13/5
y=2 3/5
x+2*13/5=7
x+26/5=7
x+5 1/5=7
x=7-5 1/5
x=1 4/5
x=1 4/5
y=2 3/5
Szczegółowe wyjaśnienie:
Odpowiedź:
x+ 2y=7
2x-y=1
x=7-2y
2•7-2y-y=1
x=7-2y
14-y=1
x=7-2y
-y=1-14
x=7-2y
-y= -13 /: (-1)
x=7-2y
y=13
x=7-2•13
x=7-26
y=13
x=-19