Answer:
y = k/x
k = 45
y = 45/x
Step-by-step explanation:
y varies inversely as x
y = 5 when x = 9
5 = k / 9
Cross product
5 * 9 = k
Constant of proportionality, k = 45
Below
Discount: 40% of $159 = $63.60
Price you pay: $159 - $63.60 = $95.40
7x−3=7k,x=7k+3,k∈ℤ
3x ≡ 2 (mod 7)
3 is a solution, since 3×3−2=7.
All solutions are 3+7ℤ
y=3x−2/7=3(x−3)+7/7=3(x−3)/7+1
