Apiece of yellow yarn was 230 inches long. after 90 inches had een cut from the piece of yellow yarn was twice as longas a piece of blue yarn. how much longer  than the blue yarn was the yellow yarn at first?  

160 inches longer.

Step-by-step explanation:

Let x represent the length of the blue yarn.

We have been given that a piece of yellow yarn was 230 inches long. After 90 inches had been cut from it, the piece of yellow yarn was twice as long as a piece of blue yarn.

Twice the length of blue yarn would be .

We can represent this information in an equation as:  

Therefore, the length of blue yarn is 70 inches long.

Now, we will subtract 70 from 230 as:

Therefore, the yellow yarn was 160 inches longer than the blue yarn.

b

step-by-step explanation:

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4