Book Maths Puzzle Algebra

solve the system by graphing, use set notation to express the solution
1. 2x+2y=0
-x+y=6

2. 5x+10y=15
y=1/2x-3

Solve the system by substitution or the additi

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Book Other Question
What is the name of the highest or lowest point on a parabola? how to factor (sin A)^3-(cos B)^3

and in this case: (sin x+cos x)(sin x-cos x) , can i take the x out or not ?