M = - 7 - 3 / - 2 - 4
m = - 10 / - 6
m = 10/6
m = 5/3
y = 5/3x + c , (4,3)
3 = 5/3(4) + c
12 = 20 + 4c
4c = - 8
c = - 2
y = 5/3x - 2
i am a mathematics teacher. if anything to ask please pm me
7.465
You could have saved some points and used a calculator! XD
The formula for simple interest is
I=PRT
here P=$1200
R=5% or 0.05
T=4 years
plugging in the formula we get
I=1200*0.05*4=240
Balance after four years =1200+240=$1440
