Solve each problem for the given variable -3c+ac=ac=4 solve for c x/y +4=x/5 solve for x

1.  

2. Factor out C


3. Divide both sides by a-3

 

1.

2. Multiply both sides by 


3. Now we need to multiply both sides by 5 


4. Change xy to a negative because it is a positive and add it to both sides.


5. Change 20y to a negative and add it to both sides 


6. Now we need to Factor out X


7. Divide both sides by 


 

Key features: the functions can not be parallels, this means that their respective slopes can not be equal or multiple to the other

Step-by-step explanation:

Take for instance 2 linear functions,  and

If they intersect in some point in the space, say that is

Then (x1,y1)=(x3,y3), (x2.y2)= (x3,y3)

So, we can compare the two functions and get the following result;

It tells us that if M=m, we get an error, meaning that the functions are in fact parallels and there is no way that they meet in some point.

hope this helps!