Determining Solutions for 3x + 4 < 9 and x + 5 > 3

Question

When are the following inequalities satisfied?

3x+4<9

3 < x+5

Video Solution

Step-by-Step Solution

To solve the given inequalities, we will handle each one individually and then find the valid range of x x where both are satisfied:

  • First Inequality: 3x+4<9 3x + 4 < 9
    Solve for x x by first subtracting 4 from both sides:
    3x+44<943x<5 3x + 4 - 4 < 9 - 4 \Rightarrow 3x < 5 .
    Next, divide both sides by 3 to solve for x x :
    x<53 x < \frac{5}{3} .
  • Second Inequality: 3<x+5 3 < x + 5
    Solve for x x by subtracting 5 from both sides:
    35<x+552<x 3 - 5 < x + 5 - 5 \Rightarrow -2 < x .

Now we combine the solutions from both inequalities:

  • From the first inequality, we have: x<53 x < \frac{5}{3} .
  • From the second inequality, we have: x>2 x > -2 .

Therefore, combining these results, the solution is the intersection of the two ranges:

2<x<53-2 < x < \frac{5}{3}, which can be expressed as 2<x<123 -2 < x < 1\frac{2}{3} .

The final solution is 2<x<123 -2 < x < 1\frac{2}{3} .

Answer

-2 < x < 1\frac{2}{3}