Question

1. (l105) fill in the blank.

a coordinate plane contains two number lines: one called the __, and the other called the __.
a) x, y
b) right, up
c) quadrant i, quadrant iii
d) x - axis, y - axis
e) none of the above

1. (l107) fill in the blank.

the graphs of second - and third - degree equations are ____ instead of straight.
a) curved
b) circled
c) squared
d) perpendicular
e) none of the above

1. (l111) fill in the blank.

all vertical lines have a slope (rate of change) of ____.
a) 1
b) 0
c) x
d) y
e) none of the above

Explanation:

1. In a coordinate - plane, the two number lines are the x - axis and the y - axis.
2. The graphs of second - and third - degree equations are curved. For example, a quadratic equation \(y = ax^{2}+bx + c\) (\(a

eq0\)) has a parabolic (curved) graph.

1. The slope of a vertical line is undefined. Since slope \(m=\frac{y_2 - y_1}{x_2 - x_1}\), and for a vertical line \(x_2=x_1\), division by zero occurs. So the answer is None of the above.

Answer:

1. d. \(x\) - axis, \(y\) - axis
2. a. curved
3. e. None of the above