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Homework Statement 1. A group of American physicists works on a project where planar lines are in the form X=t⋅P+s⋅Q where P , Q are two fixed different points and s,t are varying reals satisfying s+t=1 . They need to know formulae for the images of the line X=t⋅P+s⋅Q in the following...

Sorry! I'm new and I looked for that but couldn't find it!

2. A group of Japanese physicists works on a project where planar lines are in the form of solutions to equations a⋅x+b⋅y+c=0 where a , b , and c are fixed reals satisfying a2+b2≠0 . They need to know formulae for the images of the line a⋅x+b⋅y+c=0 in the following cases: 1. Under the...