Question

ex 5 va rog! dau coroana​

Answer 1

Răspuns:

metoda substitutiei

x+4y=10=>x=10-4y=>x=10-4×3=>x=-2

2x-5y=-19=>2(10-4y)-5y=-19=>20-8y-5y=-19=>-13y=-39=>y=3

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metoda reducerii

2x-5y=-19

4x+y=-5  I×5

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2x-5y=-19

20x+5y=-25

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22x     /   =-44=>x=-44:22=>x=-2

4×(-2)+y=-5

-8+y=-5=>y=-5+8=>y=3

Answer 2

Explicație pas cu pas:

............................. a) metoda substituției

...............................b) metoda reducerii