We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
+2
380
2
avatar+154 

FASSSTTTTTt

 Dec 13, 2017
 #1
avatar+99275 
+1

Here's 1

 

We have  the following two functions :

y =  12x  + 50

y  =  20x

 

Here's the graphs :  https://www.desmos.com/calculator/9quniellja

 

The break-even point is at  ≈  7 cars

 

This means  that if he sells 7 cars or more, he makes a profit

 

 

cool cool cool

 Dec 14, 2017
 #2
avatar+99275 
+1

The idea in the first two is to multiply through by the common denominator of both fractions

 

2.  (1/2)x + (3/2)y  = 4   multiply through by 2 ⇒  1x  + 3y   = 8

     (2/3)x  - (1/3)y  = 7  multiply through by 3  ⇒  2x -   1y   = 21

 

3.  (-1/3)x  + (1/2)y  = 5   multiply through by 6 ⇒  -2x  + 3y  = 30

     (3/4)x  -  (1/4)y  = 10  multiply through by 4  ⇒  3x  - 1y  = 40

 

4.  .5x + 1.2 y  = 2   multiply  through by 10   ⇒  5x  + 12y  = 20

     3.3x - .7y =  3     multiply through by 10   ⇒  33x  - 7y  =  30

 

 

 

cool cool cool

 Dec 14, 2017

22 Online Users

avatar
avatar
avatar
avatar