80% of 50 children passed a test. How many did not pass? ​

10 children

Step-by-step explanation:

?/50 = 80/100

Multiply 50 by 80 then divide by 100

50 times 80 = 4,000 divided by 100 is 40

40 children passed the test

Now subtract 40 from 50 to get 10

10 children did not pass the test

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