Question

Can someone please help me how to solve this what is the y coordinate of the y intercept line that passes through the points (-3,-1) and (1,7)
Do you have to do y2-y1/x2-x1?

Answer 1

Yes you need the slope. Then you need to create the formula in standard form

Answer 2

@nelsonjedi after I find the slope what do I do next?

Answer 3

Because I got 2 for the slope

Answer 4

Use either point to create the formula for your line.

Answer 5

Is it y=2x+?

Answer 6

Oh okay thanks

Answer 7

Is it -7

Answer 8

(y-y1)= m(x-x1)

Answer 9

Yes I see is that the final answer or am I supposed to add 7 to both sides?

Answer 10

Sorry I goofed m= slope = 2. So we have (y-y1)=2(x-x1)..

Answer 11

Now plug in either point I will use (1,7) so we have (y-7)=2(x-1) or y-7=2x-2.

Answer 12

Now add 7 to both sides and you get y= 2x+5

Answer 13

I got y=2x+2 is that right?

Answer 14

To find the x intercept you make y=0 and solve for x. To find the y intercept you make x =0 and solve for y

Answer 15

7+(-2)= 5 y=2x+5

Answer 16

Where'd you get the -2?

Answer 17

On the right side of the equation we have 2(x-1) we have to distribute the 2 so we end up with 2x-2. Now we have y-7=2x-2. Now add 7 to both sides

Answer 18

Oh okay that makes sense thanks so much!!!