25)
4x + 7 > 37
First, we subtract 7 from both sides:
4x+7-7> 37-7
4x>30
Then divide both sides by 4:
4x/4 > 30/4
x>7.5
Graph:
Since 7.5 is not included :
26) -5x +9 _> 24
-5x+9-9_> 24-9
-5x _>15
Since we have to divide by a negative number (-5) the inequality changes direction:
-5x/-5 15/-5
x ≤ -3
27)
7x - 28 _> -7
7x-28+28≥-7+28
7x≥21
x≥21/7
x≥3
28)
3x-5 _< 2x-13
3x-2x ≤-13+5
x ≤ -8
