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if a line has a slope of 0, then the line is horizontal |dw:1449710312935:dw|
if the slope is undefined, then the line is completely vertical |dw:1449710352524:dw|
and undefined slopes don't exist right?
can you help me with b and c please
@jim_thompson5910 r u there?
sorry the website is being laggy on my end, one moment
Okay its ok take your time :)
how far did you get with part b) ?
oh i don't really understand these three questions thats why i came here for help :)
do you have in your notes `slope intercept form` ?
y = mx + b
what does m and b represent?
m is the slope and b is the y intercept
so if you know the slope and y intercept, you can form the equation or you can go in reverse if you know the equation, you can find the slope and y intercept
what is point slope form?
y - k = m(x - h)
m is the slope and h,k is a point on the line
or you can write it as \[\Large y - y_1 = m(x - x_1)\] but you pretty much have it
your way is probably better/easier to write on a keyboard
what is one advantage of point slope form?
its an easy way of finding a line equation with two points
yes, you can find the slope of the line through those two points then you can use point slope form to plug in the slope m and one of the points (h,k)
so thats my answer for b right?
you just need to go over standard form and then you're done with part b
um i think standard form is like 10 to the power of 3 = 1000 right?
standard form, in terms of a linear equation is this Ax + By = C hopefully that looks familiar?
oh yea x,y is the point and A B C are the integers
yes (x,y) is on the line
and how do we use standard form?
standard form is useful for helping to find x and y intercepts you just plug in x = 0 to find the y intercept or plug in y = 0 to find the x intercept
and C i'm not sure about because like are they asking about normal lines or...
if two lines are parallel, what must be true of their slopes?
its not a function......
i don't know
the slopes would be equal
example y = 2x+7 y = 2x+9 both slopes are 2. If you graphed the two equations, you'll find that they never cross
if two lines are perpendicular, then the two slopes will multiply to -1 example y = 3x+5 y = -1/3x + 10 3 times -1/3 = -1, so these two lines are perpendicular. They meet at a 90 degree angle
and i think we're done now right?
yes I think that covers it all
oh good thank you soo much :)