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grishkovanyush
@grishkovanyush
July 2022
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Решите пожалуйста ! не понимаю :(
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Lebaitho
2х + у - 8 = 0 → у = 8 - 2х
3х + 4у - 7 = 0 → 3х + 4(8 - 2х) - 7 = 0 → 3х + 32 - 8х - 7 = 0 →
→ - 5х = - 25 → 5х = 25 → х = 5
у = 8 - 2х → у = 8 - 2*5 → у = 8 - 10 → у = - 2
х = 5; у = - 2
ху = 5 * - 2
ху = - 10
2 votes
Thanks 1
Lebaitho
Вот собственно и все
grishkovanyush
наверное проглядел, какой ответ получился*
grishkovanyush
х*у=?
Lebaitho
-10
кляча
Verified answer
2x+y-8=0 |*(-4)3x+4y-7=0-8x-4y+32=0 |+ эт надо сложить3x+4y-7=0 |+-5x+25=0 2*5+y-8=0-5x=-25 y=-2x=55*(-2)=-10
1 votes
Thanks 1
Lebaitho
Методом подстановки?
кляча
Да
grishkovanyush
Спасибо! )
кляча
Ок!
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Answers & Comments
3х + 4у - 7 = 0 → 3х + 4(8 - 2х) - 7 = 0 → 3х + 32 - 8х - 7 = 0 →
→ - 5х = - 25 → 5х = 25 → х = 5
у = 8 - 2х → у = 8 - 2*5 → у = 8 - 10 → у = - 2
х = 5; у = - 2
ху = 5 * - 2
ху = - 10
Verified answer
2x+y-8=0 |*(-4)3x+4y-7=0-8x-4y+32=0 |+ эт надо сложить3x+4y-7=0 |+-5x+25=0 2*5+y-8=0-5x=-25 y=-2x=55*(-2)=-10