1238.
1) 2x - ( 20 - 5x) = 1
x = 3
y = 20 - 5×3
y = 5
(x,y) = (3,5)
2) 2x - (27 - 4x) = 9
x = 6
3y = 27 - 4 × 6
y = 1
(x,y) = (6,1)
3) - (2 - 3y) +5y = -18
y = -2
- 2x + 5 × (-2) = -18
x = 4
(x,y) = (4, -2)
4) 2(39-4у) - у = 15
у = 7
x = 39 - 4 × 7
x = 11
(x,y) = (11,7)
1239.
1) 7x + 11 - 5x = 9
x = -1
2y = 11 - 5 × (-1)
y = 8
(x,y) = (-1,8)
2) 9x + 7 - x = -17
x = -3
-2y = 7 - (-3)
y = -5
(x,y) = (-3,-5)
3) 13 - 5y +7y = 19
y = 3
x = 13 - 5 × 3
x = -2
(x,y) = (-2,3)
4) 5y + 11 - y = 15
- 2x = 11 - 1
x = -5
(x,y) = (-5,1)
Пошаговое объяснение:
1238.
1) 2x - ( 20 - 5x) = 1
x = 3
y = 20 - 5×3
y = 5
(x,y) = (3,5)
2) 2x - (27 - 4x) = 9
x = 6
3y = 27 - 4 × 6
y = 1
(x,y) = (6,1)
3) - (2 - 3y) +5y = -18
y = -2
- 2x + 5 × (-2) = -18
x = 4
(x,y) = (4, -2)
4) 2(39-4у) - у = 15
у = 7
x = 39 - 4 × 7
x = 11
(x,y) = (11,7)
1239.
1) 7x + 11 - 5x = 9
x = -1
2y = 11 - 5 × (-1)
y = 8
(x,y) = (-1,8)
2) 9x + 7 - x = -17
x = -3
-2y = 7 - (-3)
y = -5
(x,y) = (-3,-5)
3) 13 - 5y +7y = 19
y = 3
x = 13 - 5 × 3
x = -2
(x,y) = (-2,3)
4) 5y + 11 - y = 15
y = 1
- 2x = 11 - 1
x = -5
(x,y) = (-5,1)
Пошаговое объяснение: