Can you help me with the following math problems?(algebra 1)?

Question

thanks sooooooo much for your help!

1: 1/2h(x+y)=A, if h=8, x=12, and A=400, find y

2: the slope of a line= y*y - y

______

x*x - x for any two points in the coordinate plane. Find the slope of the line between the following ordered pairs

(5,10) and (3,6)

(7,20) and (-3,-10)

(8,15) and (8,25)

(10,9) and (15,9)

3. Using the Distance Formula on the coordinate plane, find the distance between the following points:

(6,4) and (2,1)

(0,0) and (5,10)

-5,2 and (7,-7)

THANKSSSS!

Answer 1

I know those answers but you should go on your own. It's cheating if you ask people when you are doing work. Why not borrow a book or something? To put you out of your problems in your brain? It'll work don't blame me if it doesn't.

Answer 2

1) first plug in the numbers.  1/2(8)(12+y)=100

Then multiply 1/2 by 8 which is 4 so... 4(12+y)=100

then divide both sides by 4 to get ride of the 4... 12+y=25

subtract 12 from 25 to get y which is 13. so y=13.

2) easy way to find slope of a line. if there are two sets of coordinates, let the first set be label (x1, y1) and the second set the label (x2, y2).

To get the slope of the line that these two points lie on, just do (y2-y1)/(x2-x1). There's your slope.

3) let the coordinate pairs again be (x1, y1) and (x2, y2) then just enter them into the distance formula, which is here http://www.purplemath.com/modules/distfo...

Answer 3

Actually for slope, the formula is y1-y2/x1-x2 or rise(the first "y" take away the second "y") over run (the first "x" take away the second "x") doesn't matter which is the first or second x or y as long as you do it right. also for the first problem make it so 1/2 * 8(12*y)=400 AKA plug the numbers in, the move y so y= numbers.

Hope this helps.