Пошаговое объяснение:
1.
5x + 4 = x + 12
5x - x = 12 - 4
4x = 8
x = 8 : 4
x = 2
2.
13 - 5y = 8 - 2y
5y - 2y = 13 - 8
3y = 5
y = 5 : 3
y = 1 2/3
3.
5x + (3x - 7) = 9
5x + 3x - 7 = 9
8x - 7 = 9
8x = 9 + 7
8x = 16
x = 16 : 8
1) 5x+4=x+12
5x-x=12-4
4x=8
x=8÷4
x=2
2) 13-5y=8-2y
-5y+2y=8-13
-3y=-5
y= -5/-3
y=1,6
3) 5x+(3x-7)=9
8x=9+7
8x=16
Пошаговое объяснение:
1.
5x + 4 = x + 12
5x - x = 12 - 4
4x = 8
x = 8 : 4
x = 2
2.
13 - 5y = 8 - 2y
5y - 2y = 13 - 8
3y = 5
y = 5 : 3
y = 1 2/3
3.
5x + (3x - 7) = 9
5x + 3x - 7 = 9
8x - 7 = 9
8x = 9 + 7
8x = 16
x = 16 : 8
x = 2
Пошаговое объяснение:
1) 5x+4=x+12
5x-x=12-4
4x=8
x=8÷4
x=2
2) 13-5y=8-2y
-5y+2y=8-13
-3y=-5
y= -5/-3
y=1,6
3) 5x+(3x-7)=9
8x=9+7
8x=16
x=2