book Maths Puzzle Numerical Ability

Graph the linear system and estimate the solution.Then check the system algebraically.

2x+y=9
-x+6y=-1

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book Other Question
how many kilograms of pure salt must be added to 20 kilograms of a 10 percent salt solution to obtain a 25 percent salt solution? Hi There!

I really need help understanding Factoring with a Zero Product. Could someone please explain this problem to me?

-2x^2 -2x + 24=0

Thanks to all