Answer:
x=8
Step-by-step explanation:
2x+9=3x+1 
-3 -3
 -9 -9
-1x=-8 
divide both side by -1. 
x=8 
 
        
             
        
        
        
Linear means the highest exponent on the placholder is 1
it is also just a straight line
y=|x| is like y=(√x)², it is 2 straight lines
B. y=x², exponent is 2 so no
C. y=-3x³, exponent is 3, so no
D. y=1/4x, yep
D is the answer
        
                    
             
        
        
        
The question is saying that the line KJ is approximately equal to the line JN and that the line JN is perpendicular to the line NL. The line labeled LKN is shorter than LNK due to the fact that the line segments in LNK are longer because JN is perpendicular to NL:) 
        
             
        
        
        
Let her sisters age be x.
=>sister .....x
Sarah. 
twice x=2x. then less than 5
=> (2x-5 )
if Sarah = 15 years 
by substation, 2x-5=15