Question 1053517
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Hi  
Find y such that line AB and line CD are parallel
parallel Lines have same slope:  
m = m ={{{(y[1] - y[2])/(x[1] - x[2] )}}}
A(-12,-6) and 
B( 8 , 9)  m = -15/-20 = 3/4
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C(6,6) and 
D(14,y)   m = {{{(6-y)/(-8) = 3/4}}}
4(6-y) = -24
24 -4y = -24
48 = 4y
y = 12
{{{drawing(300,300, -15,15,-15,15,   
 grid(1),
circle(-12,-6,0.4),
circle(8,9,0.4),
line(-12,-6,8,9),
circle(6, 6,0.4),
circle(14,12,0.4),
line(6,6,14,12),
graph( 300, 300, -15,15,-15,15,0))}}}