1. 7x < 56
7x:7 < 56:7
x<56:7
x<8
2. -8x ≤ - 30
-8x:(-8)≥-30:(-8)
x≥-30:(-8)
x≥30:8
x≥[tex]\frac{30}{8}[/tex]
x≥[tex]\frac{15}{4}[/tex]
3. [tex]\frac{x}{5} > 9[/tex]
[tex]5*\frac{x}{5} > 5*9[/tex]
x>5*9
x>45
4. -3(2x+1)>5-2x
-6x-3>5-2x
-6x-3+2x>5
-6x+2x>5+3
-4x>5+3
-4x>8
x<-2
5. -4(3-x)-2(3+x)≥0
-12+4x-2(3+x)≥0
-12+4x-6-2x≥0
-18+4x-2x≥0
-18+2x≥0
2x≥18
x≥9
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Answers & Comments
1. 7x < 56
7x:7 < 56:7
x<56:7
x<8
2. -8x ≤ - 30
-8x:(-8)≥-30:(-8)
x≥-30:(-8)
x≥30:8
x≥[tex]\frac{30}{8}[/tex]
x≥[tex]\frac{15}{4}[/tex]
3. [tex]\frac{x}{5} > 9[/tex]
[tex]5*\frac{x}{5} > 5*9[/tex]
x>5*9
x>45
4. -3(2x+1)>5-2x
-6x-3>5-2x
-6x-3+2x>5
-6x+2x>5+3
-4x>5+3
-4x>8
x<-2
5. -4(3-x)-2(3+x)≥0
-12+4x-2(3+x)≥0
-12+4x-6-2x≥0
-18+4x-2x≥0
-18+2x≥0
2x≥18
x≥9