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angilaterezinha
@angilaterezinha
July 2022
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URGENTEE!
-21X-3y= -9
X+4Y= 12
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Tábata121
Verified answer
I)-21x -3y = -9
II)x + 4y = 12 ⇒⇒⇒⇒⇒ x = 12 -4y
x= 12 - 4. (-53)
Substituindo em I) x= 12 + 212
-21x -3y = -9
x=224
-21 .(12-4y) -3y = -9
-252 + 84 -3y = -9
-3y = -9 +252 -84
-3y= 243 -84
-3y= 159 . (-1)
3y = -159
y= -159 / 3
y=-53
Bons estudos!
2 votes
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angilaterezinha
Obrigada!
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Verified answer
I)-21x -3y = -9II)x + 4y = 12 ⇒⇒⇒⇒⇒ x = 12 -4y
x= 12 - 4. (-53)
Substituindo em I) x= 12 + 212
-21x -3y = -9 x=224
-21 .(12-4y) -3y = -9
-252 + 84 -3y = -9
-3y = -9 +252 -84
-3y= 243 -84
-3y= 159 . (-1)
3y = -159
y= -159 / 3
y=-53
Bons estudos!