# Math Help - i was just wondering if these problems i did were right?

1. ## i was just wondering if these problems i did were right?

If A(2, 2), B(5, 5), and C(8, 8), then which is AC - BC?

4

Which value of d makes the graph of the equation 3x - dy = 5d perpendicular to the graph of y = 3x - 4?
d = -9
d = 9
d = 6
d = 3
Which values of m and n make the midpoint of AB locate at the origin, given A(m, 11) and B(-5, n)?
m = 5 and n = -11
m = 11 and n = -5
m = 10 and n = -22
m = -10 and n = 22
Which line is passing through (3, 5) and is parallel to x-axis?
y = -3x
y = 3
y = 5
y = 3x + 5
Which point is on the graphs of the lines y = 3x + 2, 2x + 3y = 39, and 2x = 3y - 27?
(-1, 11)
(1, -11)
(3, 11)
(2, 11)

2. $\begin{array}{l}
D(A,C) = \sqrt {\left( {2 - 8} \right)^2 + \left( {2 - 8} \right)^2 } \\
D(B,C) = \sqrt {\left( {5 - 8} \right)^2 + \left( {5 - 8} \right)^2 } \\
\end{array}$

3. ## ac-bc

That would make it 4 right? Is that the only one I got right? also chose -9, m=5 and n=-11, y=3x+5, and (2,11)