Write an equation that says that the length of the green line is equal to the length of the black line minus the length of the blue line. Combine like terms.
27
11
2v
Green line = Black line - Blue line
Length of Green line = Length of Black line - Length of Blue line
Let G be the length of the Green line, B be the length of the Black line, and C be the length of the Blue line.
The equation is:
G = B - C
Substituting the given values:
27 = 11 - 2v