Question

Find the coordinates of two points on the line with the given equation. Then use the points to find the slope of the line.
Questions:
1)y= -3 + 11
2) y = -17
3) y = 7/8x - 11
4) 9x + 8y = 56
5) x=10
6) 7y - 3x = -147

>Thank you in advance

Answer 1

I won't tell you the answers, but I will tell you how to solve it.
Do you have a graphing calculator?
If so, go to "y=", type in the equation after the equal sign, and then press"2nd" then "graph".
If not, use this site: http://www.meta-calculator.com/online/
Select "graphing calculator", type in the numbers after equals in the first "y=" box.
Select "table"
Scroll down and seclect "create table".
Those are your points.

To find the slope, you take the two points and use this formula: \[\frac{ y ^{2}-y ^{1} }{ x ^{2}-x ^{1} }\]

Example (#1):
1)y= -3 + 11
2 points are (-7,8) and (-6,8)

Now for the slope formula, you will subtract the the first y point from the second and put it over the second x point minus the first x point.

So: \[\frac{ 8-8 }{ -6+7 }\] (since two negatives make a positive, - -7 would be +7).

So your answer is \[\frac{ 0 }{ 1 }\]

And since zero is on top, your slope is zero. If zero was on bottom, your slope would be undefined.