True/False Quizzes for
Finite Mathematics
Topic: Functions and Linear Models
(Chapter 1)

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1. The graph of any equation in two variables is a straight line.
2. The graph of any linear equation in two variables is a straight line.
3. If f(x) = x2 + 3x, then f(1) = 4.
4. If f(x) = 2x2 + 1, then f(3) = 37.
5. If f(x) = 2, then f(1) is not defined.
6. Every straight line has a slope.
7. Every line is the graph of a linear equation in two unknowns.
8. To find the equation of a line, all you need is a point and the slope.
9. You need to know the y-intercept to write down the equation of a line.
10. The graph of a quadratic function f(x) = px2+qx+r (with p nonzero) is always a parabola.
11. In a linear cost function, the slope gives the cost of the first item.
12. If displacement is a linear function of time, then the slope of the graph represents the velocity.
13. If y is a linar function of x, then y increases by a fixed amount for each increase of one unit in y.
14. If the weekly sales q of an item priced at $p are given by q = 3p + 40, then the weekly sales decrease by 3 items for every $1 increase in price.
15. If the total weekly revenue for items priced at $p is given by the function R(p) = -p2 + 100p, then the total weekly revenue will be $100 if we give the items away.
16. A real valued function of a real variable is a rule that assigns a number to each specified number in a specified domain.
17. Some functions assign two or more values to certain numbers in their domains.
18. The regression line associated with two data points (with different x-coordinates) always passes through both points.
19. The regression line associated with three data points (with different x-coordinates) always passes through at least two of those points.
20. The regression line associated with a collection of more than two data points may pass through none of those points.

Last Updated: April, 1997
Copyright © 1995 Stefan Waner & Steven R. Costenoble