100 point reward with certified answer. 4 basic algebra questions, must show work. if the answers are wrong your response will be deleted and the points taken back. good luck!

Y=kx
12=-4k
  k = -3

so when y = 15
y = kx
15 = -3x
  x = -5



$50 / 0.04 = $1250 (4% interest)

so
1250 * 0.06 = $75

answer
interest $75 at 6%



y = kx
1/4 = 4k
k = 1/16

when x = 5
y = kx
y = 1/16(5)
y = 5/16 


y = kx
-5 = 4k
k = -5/4

direct equation
y = -5/4x