Find an equation for the LINE that satisfies the conditions:

#11 slope = 2/3; y intercept is 9

#12 slope = 7; y intercept is -3

#13 passes through (2, -1) and (0,1)

#14 passes through (2, 3) and (4,4)

can can somebody please explain this and maybe answer one or two so I can see how it works??

Hamiltrash
Jan 2, 2018

#1**+1 **

See if you can work out the first two from this:

https://www.youtube.com/watch?v=wvE9-3pHcMo

And the second two from this:

Melody
Jan 2, 2018

#2**+1 **

#11 slope = 2/3; y intercept is 9

#12 slope = 7; y intercept is -3

#13 passes through (2, -1) and (0,1)

#14 passes through (2, 3) and (4,4)

I'll do 11 and 13......try to do the other two.......12 is similar to 11 and 14 is similar to 13

11.....if the y intercept is 9, the point (0,9) is on the graph

So.....we have.....

y = (2/3)(x - 0) + 9

y = (2/3)x + 9

13.....first.....find the slope =

[subtract the y values in some order] / [ subtract the x values in the same order ]

[ 1 - -1 ] / [ 0 - 2 ] = 2 / -2 = -1

So.....using the slope and either of the points - I'll use (0, 1) - we have

y = -1 (x - 1) + 0

y = -x + 1

CPhill
Jan 2, 2018