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Are the following statements true or false?

1. The linear relations $2 x - 3 y = 4$ and $y = - \frac{2}{3} x +5$ represent lines that are perpendicular.

2. Any equation of the form $y = constant$ must be a horizontal line.

3. The slope of a straight line is constant.

4. Slope describes the slant of a line.

5. Any equation of the form $x = constant$ must be a horizontal line.

6. All linear relations are functions.

You can earn 30% partial credit for 2 - 3 correct answers, and 60% partial credit for 4 - 5 correct answers.