Point-slope form of a line: We need a point (x₀,y₀) and the slope "m";
y-y₀=m(x-x₀)
We have the next equation of line:
y=1/2 x-2  (slope-intercept form y=mx+b)
the slope of this line is 1/2  (m=1/2)
And any one point could be:
if x=0; then y=1/2 (0)-2=-2  (0,-2)
Therefore, we already have the point (0-,2) and the slope (m=1/2)
y-y₀=m(x-x₀)
y+2=1/2(x-0)
Answer: the point slope form of y=1/2 x-2; would be:
y+2=1/2(x-0)
        
             
        
        
        
Answer: 172
Step-by-step explanation:
If what I did is right, the answer is 172.2 since 41/5 is 8.2 and I multiply 8.2 times 21, I get 172.2, which rounds to 172. 
 
        
             
        
        
        
Answer:
y = - 1/4 x + 1 
Step-by-step explanation:
Find two convenient integer coordinates like   -4,2 and  4, 0 
   use these points to  calculate the slope to be -1/4
    intercept is b = 1
y = -1/4 x + 1