Answer:
34 and 17 
Step-by-step explanation:
x+y=51
2y=x
2y+y=51
3y=51
y=17
2(17)=x
x=34
 
        
             
        
        
        
Simply substitute the value of 
3
 given. In other words, 
f
(
3
)
 is the function of 
f
(
x
)
, however, in this case, 
x
 is 
3
f
(
3
)
=
3
(
3
)
−
4
Distribute 
3
 through the parenthesis
f
(
3
)
=
9
−
4
Simplify
f
(
3
)
=
5
 
        
             
        
        
        
Answer:
In the equation y = mx + b for a straight line, the number m is called the slope of the line. Let x = 0, then y = m • 0 + b, so y = b. The number b is the coordinate on the y-axis where the graph crosses the y-axis.
 
        
                    
             
        
        
        
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Answer:
20 m
Step-by-step explanation:
4(3+2) = 20