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1 1/2x+6=10
1/2 8 =8x1...8:2=4+6=10

3. 4+2=6-3=3
2+4-3=6
2+4-2=6


4 2+5=7

5 4+17=21

1. -1/2x +6 <= 10
-1/2x<=10-6
-1/2x<=4
x>=4: -1/2
x>=4x-2/1
x>= -8
2. 6x-5 > = 3x + 10
6x-3x >= 10+5
3x >= 15
x >= 15:3
x >= 5
4. 2x +3y = 7 |x1 | 2x +3y =7
x +5y = 7 |x2| 2x +10y=14
----------------- -
-7y = -7
y = -7/-7
y = 1
2x+3y = 7
2x+3 (1) = 7
2x+3 =7
2x =7-3
2x = 4
x = 4/2 = 2
5. 3x + 2y = 22 |x 1 | 3x + 2y = 22
4x + y = 21 |x 2 | 8x + 2y = 42
------------------- -
-5x + 0 = -20
-5x= -20
x = -20/-5
x = 4
3x + 2y = 22
3(4) + 2y = 22
12 + 2y = 22
2y = 22-12
2y = 10
y = 10/2 = 5