Sample quiz on representation of linear relations
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1. Relations can be represented by $\cdots$
   
   tables
   graphs
   equations
   all of the above
   
2. In a table of values for a linear relation $\cdots$
   
   the first differences are constant
   the first differences are equal to zero
   the second differences are constant
   the second differences are equal to zero
3. The graph of a linear relation is $\cdots$
   
   a curve
   a parabola
   a straight line
   a horizontal line
4. In an equation of a linear relation, the (positive integer) exponents on $x$ and $y\quad \cdots$
   
   should both be zero
   should both be one
   should both be at least one
   should both be at most one
5. Which of the equations below represent a linear relation?
   
   $y-2x^2-4=0$
   $y-2x-4=0$
   $y-2x^{-1}-4=0$
   $y-2x^{-2}-4=0$
6. If the equation $y=3x^{k}-12$ is to represent a linear relation, what value should $k$ take?
   
   $1$
   $2$
   $-1$
   $-2$
7. For what value of $k$ is the relation $y=2x^{2}+k$ a linear relation?
   
   $k=0$
   $k=1$
   no value of $k$
   all values of $k$
8. Which of the following is not a linear relation?
   
   $y=0$
   $y=1$
   $y=x$
   $y=x^2$
9. The first differences from a table of values of a linear relation are always constant. In addition:
   
   they can be positive or negative
   they are always positive
   they are always negative
   they are always zero.
10. If the first differences for a linear relation is zero, then:
    
    the graph will be vertical
    the graph will be horizontal
    the graph will make angle $45^{\circ}$ with the $x$-axis
    the graph will make angle $90^{\circ}$ with the $x$-axis