Solve the system: x + y = 9 and x − y = 3.

7. Which of the following statements about Xiao Li is TRUE?

What is the slope of the line passing through the points (2, 6) and (6, 1)?

Consider the line represented by the equation y = −3x + 7. What is the y-intercept?

4. Which statement about the writer (小音) is CORRECT?

Simplify by combining like terms: 4x − 7 + 2x + 5.

3. At what time did the conversation take place?

This listening file is for both Questions 9 & 10.  9. Which of the following statements is TRUE?

    1.¿De qué  colores son los marcadores? 2. ¿De qué color es el lápiz mecánico?  

At a constant temperature of 20 a sample of gas expands as shown in the diagram below.  The initial pressure of the sample of gas is 1.35 atm what is final pressure of the gas sample after its change in volume?