4. Normal body temperature is 98.6 degrees Fahrenheit, although it varies slightly for some people. Someone ?
        
                    
             
        
        
        
U can refer to the picture that I’ve attach below
 
        
             
        
        
        
Answer:
a=(2/5), b = (-2,6)
Step-by-step explanation:
well slope formula is rise/run. So for the first one you start at the point  rise 2 run 5 and you reach the endpoint. That is how you know you got the correct slope.  (2/5)
For the second one you start at the first point and you cannot go up because it is a negative slope you run 6 till you hit the other point go down 2. Since you go down 2 that would make it -2.  (-2,6)
 
        
             
        
        
        
Answer:
Top left
Step-by-step explanation:
In order for it to be a function, it has to pass the vertical line test.  So draw a line down the middle of the graphs.  If it passes once, then it is a function, if it passes more than once it is not.
 
        
             
        
        
        
Hello :
<span>7x-2y=1 ...(1)
 2y=x-1...(2)
</span><span>substitution  2y in (1) :
</span>7x-(x-1) = 1
7x-x+1 = 1 
7x = 0
x=0
in (2) :   2y = 0-1
2y = -1        y=  -1/2
the <span>system have one solution :  (0 ;-1/2)</span>