R= √a/3
rearrange to make a the subject
srsl hel

a = 9r²

Step-by-step explanation:

Given

r = ( multiply both sides by 3 to clear the fraction

3r = ( square both sides )

(3r)² = ( )²

9r² = a

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