Answer:
Both of these equations are in slope-intercept form. The slope-intercept form of a linear equation is: y=mx+b
 Where m is the y-intercept value.
y=-2x+5
y=-2x+20 
The slope of the two equations are: m1=−2 and m2=−2
Step-by-step explanation:
Because the have the same slope it means the lines represented by these two equations are either parallel or are the same line.
The y-intercepts for the two lines are:b1 = 5 and b1=20
 
        
             
        
        
        
Answer:
5/10
Step-by-step explanation:
 
        
             
        
        
        
Sum of linear pair of angles = 180°
so 
<EFG + <GFH = 180°
2n + 21 + 4n + 15 = 180°
6n + 36 = 180°
6n = 144
 n = 24
<EFG = 2(24) + 21 = 69°
<GFH = 4n + 15 = 4(24) + 15 = 111°