Can someone help me on my math work? I'm not sure how to do it. You don't have to help me on every question, but if you could do a couple with that would be great, just so i know how to do the rest. I have a midterm coming up and I want to make sure i'm doing it correctly.

Question

readergirl12 · Answer

I'll try...What grade are you in?

anonymous · Answer

attachment

anonymous · Answer

I'm in 10th grade.

readergirl12 · Answer

Hm...Okay give me a moment.

anonymous · Answer

okay

zpupster · Answer

hey were you helped

zpupster · Answer

sorry now i have to run.

kobeni-chan · Answer

Do you still need help? If not, please close the question :)

anonymous · Answer

Yes. I still need some help.

whpalmer4 · Answer

which part do you need help with?

whpalmer4 · Answer

Looking at your first page, a common task seems to be to find out if the lines are parallel or perpendicular.

Two lines which are parallel will have an identical slope.  

Two lines which are perpendicular will have slopes such that if you multiply them together, the result is $-1$.  The only case where this does not hold true is if your lines are parallel to the x and y axes, in which case their equations will be of the form $$x=c$$and$$y=d$$where $c,d$ are constants.  A vertical line has an undefined slope, and a horizontal line has a slope of $0$, so you cannot multiply them together to get $-1$.

If you rearrange your equation for the line to be in what is called slope-intercept form:
$$y = mx + b$$$m$ is the slope and $b$ is the $y$-intercept value

It is easy to compare two equations in this form and determine if they are parallel (the number in front of the $x$ will be the same\) or perpendicular (multiply the number in front of the $x$ from each equation, if the product is $-1$, they are perpendicular).

anonymous · Answer

Can you show me how to  do the first problem  where you have to state the slope and tell whether its parallel perpendicular or neither? So I can I have an example to follow.

whpalmer4 · Answer

I thought I already did :-)

$$y = \frac{4}{3}x+5$$Compare that with the slope-intercept form:$$y=mx+b$$what is the value of $m$ and what is the value of $b$?
The value of $m$ is the slope.

whpalmer4 · Answer

the other line has equation 
$$y = -\frac{3}{4}x-1$$Again, compare with $$y=mx+b$$What is the value of $m$?  Is it equal to the $m$ in the previous equation?  If it is, they are parallel.  If it is not, multiply them together.  Do you get $-1$? If so, they are perpendicular.  That's all there is to it.

anonymous · Answer

Oh, okay. Thank you! I have a midterm next week, and I'm so nervous.