Y = 3x-5
А) 3 = 3 * 4 - 5
3 = 7 ( Нет)
Б) -2 = 3 * 11 - 5
-2 = 26 ( Нет)
В) -1 = 3 * -8 - 5
- 1 = - 29 ( Нет)
Решение
8x + 3y = 16
y + 2x = 4
y = 4 - 2x
8x + 3*(4 - 2x) = 16
8x + 12 - 6x = 16
2x = 4
x = 2
y = 4 - 2*2
y = 0
Ответ: (2;0)
<=>{x=3-y <=>{y=7 <=>{y=7
{3*3-y=13 {×=3-y {×=-4
__________ ______
-y=13-6 x=3-7
-y=7 x=-4
y+
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