1) 2(3x - y) - 5 = 2x - 3y6x - 2y - 5 = 2x - 3y6x - 2y - 2x = 3y - 54x - 2y = 3y - 54x + 5 = 3y + 2y4x + 5 = 5y4x = 5y - 54x = 5(y - 1)x = 5/4(y - 1)
2) 5 - (x - 2y) = 4y + 165 - x + 2y = 4y + 16-x + 2y - 4y = 16 - 5-x - 2y = 11x + 2y = -11
Подставляем x из первого уравнения во второе:5/4(y - 1) + 2y = -115y/4 - 5/4 + 2y = -115y - 5 + 8y/4 = -115y - 5 + 2y = -117y - 5 = -117y = -6y = -6/7
Затем находим x:x = 5/4(y - 1)x = 5/4(-6/7 - 1)x = 5/4(-13/7)x = -65/28
Итак, решение системы уравнений:x = -65/28,y = -6/7.
1) 2(3x - y) - 5 = 2x - 3y
6x - 2y - 5 = 2x - 3y
6x - 2y - 2x = 3y - 5
4x - 2y = 3y - 5
4x + 5 = 3y + 2y
4x + 5 = 5y
4x = 5y - 5
4x = 5(y - 1)
x = 5/4(y - 1)
2) 5 - (x - 2y) = 4y + 16
5 - x + 2y = 4y + 16
-x + 2y - 4y = 16 - 5
-x - 2y = 11
x + 2y = -11
Подставляем x из первого уравнения во второе:
5/4(y - 1) + 2y = -11
5y/4 - 5/4 + 2y = -11
5y - 5 + 8y/4 = -11
5y - 5 + 2y = -11
7y - 5 = -11
7y = -6
y = -6/7
Затем находим x:
x = 5/4(y - 1)
x = 5/4(-6/7 - 1)
x = 5/4(-13/7)
x = -65/28
Итак, решение системы уравнений:
x = -65/28,
y = -6/7.