Coordinate geometry!

aronyohann · #1 $Old$ June 24th, 2009, 08:12 PM

The slope of a line that is perpendicular to a line whose slope is 3/8 is:

-8/3
OR
3/8
OR
8/3

The equation of the line through point (- 4, 0) and parallel to the y-axis is

x = -4
OR
y = -4
OR
x + y = -4

The equation of the line through point (- 4, 0) and parallel to the y-axis is:
X= -4
OR
y = -4
OR
x + y = -4

http://media01.owotw.com/geo_2008/8/groupi94.gif

In the figure, M and N are midpoints of RT and ST. What is the length of MN?
a + b
OR
b - a
OR
2

A square has symmetry with respect to a line containing a median of the square.
True
OR
False

I-Think · #2 $Old$ June 24th, 2009, 08:45 PM

The slope of a line that is perpendicular to a line whose slope is 3/8 is:

Ans:-8/3
The product of the gradients of two lines that are perpendicular to each other is -1

The equation of the line through point (- 4, 0) and parallel to the y-axis is

Ans:x = -4

Question repeated

In the figure, M and N are midpoints of RT and ST. What is the length of MN?

Ans: b - a
Midpoint of a line: $(\frac{x_1+x_2}{2})(\frac{y_1+y_2}{2})$

A square has symmetry with respect to a line containing a median of the square.
Forgive my ignorance please. What's the median of a square?