Ryan bought a book for $3.12 and a pencil for $0.98. He paid with a $5 bill. About how much change will he receive

$0.90

Step-by-step explanation:

$3.12+$0.98=$4.10

5-4.1=0.9

both equations and proportions are better.

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