Let us try to formulate the expressions one by one.
let the number be x.
Step 1:
six time the number is 6*x = 6x
Step 2:
product of the number and -3 is -3x
Step 3:
now let us make equation for it:
adding 3x on the left side,
dividing right side by 9
x=45/9 = 5
So the number is x=5
Answer:
B) No Unique Solutions
Step-by-step explanation:
Given:
now we now the value of y = 2 so we will substitute in equation
Now, We have value of y=2 and value of 
Substituting in both the value in equation
which means that the equation has Infinite solutions.
The bill after applying the coupon = 31.84*(85%) = 27.064
so each of them will pay : 27.064/3 = $9.021
Here is the solution..x equals to √3..which is equals to 1.73205
