I would solve the first equation for x and then sub that value into x in the second equation.  That's the easiest way.  x - 2y = 3 solved for x is x = 2y+3.  Now sub that in for x in the second equation: 5(2y+3)+3y=2 and 10y + 15 + 3y = 2.  13y = -13, and y = -1.  Now sub that y value into either equation to solve for x: x = 2(-1) + 3 gives us an x value of x = 1.  Therefore, your solution to this system is (1, -1), first choice above. 
        
             
        
        
        
a = length of one side.
Area of a square = a^2
in our problem,
Area = 169 square inches
a = ?
Plug our numbers into the area formula mentioned above.
169 in^2 = a^2. 
Take the square root of each side to find the side length of the square shaped platter.
13 = a
 
        
             
        
        
        
Answer:

Step-by-step explanation:
So we have the function: 

To find the inverse function, switch x and f(x), change f(x) to f⁻¹(x), and solve for f⁻¹(x). Therefore: 

Switch: 

Add 1 to both sides: 

Divide both sides by 6: 

And that's our answer :)
 
        
             
        
        
        
Subtract 15 from both sides
You want to focus on isolating the variable (x)