Find the difference between the X and Y values goven:
10 - 1 = 9
12 - 3 = 9
15 - 6 = 9
The difference is 9, so the rule is subtracting 9 from the x value:
y = x -9
Now find Y when x is 20:
y = 20-9
y = 11
Answer:
$12
Step-by-step explanation:
80% is 4/5 of the price. 15/5=3 3x4=12
or you can
15/100= 0.15 0.15x80=12
