In each pair of equations solve the equations below with work.
a) 0=3x + 6 y= 3x + 6
b) 0= x - 2 y= x - 2
c) 0= 3x + 10 y= 3x + 10
d) in each pair, how is the solution to the first equation related to the graph?

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

- (2, -7)

- lines r and s and lines t and u must be parallel