ME AJUDEM POR FAVOR, PRECISO DA RESPOSTA PRA HOJE. COLOQUEM O CÁLCULO NECESSÁRIO, VALENDO 5 ESTRELAS!!
o resultado no livro da 40, só que eu não entendo o porque, me ajudem pls!
5x-y=-20
5x+y=-2
10x=-22
x=-22/10
x=-2.2
5-(2.2)+y=-2
-11+y=-2
y=-2+11
y=9
25x²-y²=
25(2.2)²-9²=
25*4.84-81=
121-81=40
5x+5x-y+y=-20+(-2)
10x=-20-2
===============
x=-2,2 ///
===================================
5.(-2,2)-y=-20
-11-y=-20
-y=-20+11
-y=-9 => y=9
5(-2,2)-9=-20
-11-9=-20
==================
5.(-2,2)9)=-2
-11+9=-2
=======================
S={-2,2;9}
==================================================
25.(-2,2)²-1(9)²
25.(4,84)-1(81)
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Answers & Comments
5x-y=-20
5x+y=-2
10x=-22
x=-22/10
x=-2.2
5x+y=-2
5-(2.2)+y=-2
-11+y=-2
y=-2+11
y=9
25x²-y²=
25(2.2)²-9²=
25*4.84-81=
121-81=40
5x-y=-20
5x+y=-2
5x+5x-y+y=-20+(-2)
10x=-20-2
10x=-22
===============
10x=-22
x=-22/10
x=-2,2 ///
===================================
5.(-2,2)-y=-20
-11-y=-20
-y=-20+11
-y=-9 => y=9
5(-2,2)-9=-20
-11-9=-20
==================
5.(-2,2)9)=-2
-11+9=-2
=======================
S={-2,2;9}
==================================================
25.(-2,2)²-1(9)²
25.(4,84)-1(81)
121-81=40