Answer:
-0.53571428571
Step-by-step explanation:
 
        
             
        
        
        
the equation framed in the form of y=kx is   and ,  x as a function of y
 and ,  x as a function of y  .
 .
<u>Step-by-step explanation:</u>
Here we have , The amount Lin's sister earns at her part-time job is proportional to the number  of hours she works. She earns $9.60 per hour. We need to find  an equation in the form y=kx  to describe this situation, where x represents the hours she works and y  represents the dollars she earns.Is y a function of x . Also , Write  an equation describing x as a function of y . Let's find out:
Here ,  Lin's sister earns $9.60 per hour . Let  x represents the hours she works and y  represents the dollars she earns . So , According to question following is the equation framed in the form of y=kx :
⇒ 
Yes, y is a function of x , as a straight line with a slope of 9.6 
Now ,  x as a function of y :
⇒ 
⇒ 
Therefore , the equation framed in the form of y=kx is   and ,  x as a function of y
 and ,  x as a function of y  .
 .
 
        
             
        
        
        
Answer:
(x,y)=(-10, -30)
Step-by-step explanation:
x/4 -y/12 = 0
--> x/4 = y/12
substitute into the first eq. 
x/4 + y/12 = -5
y/12 + y/12 = -5
2y/12 = -5
y= (-5) * 12/2 = -30
solve for x, x/4 = (-30)/12 
x=4* (-30)/12 = -10 
 
        
             
        
        
        
Type 1 rice :
 7-ounce package costs = 2.59.
Cost of 1-ounce of Type 1 rice= 2.59/7 = $0.37
Type 2 rice :
12-ounce package costs = $4.56  
Cost of 1-ounce Type 2 rice = 4.56/12 = $0.38
Type 3 rice :
18-ounce package costs  = $ 6.30
Cost of 1-ounce Type 3 rice = 6.30/18 = $0.35.
From the above calculations, we can see that the cost of 1-ounce Type 3 rice is lowest. Therefore, 18-ounce package is Best Buy.