WILL GIVE BRAINLIEST i can calculate well so i just need someone to set it up for me!! i think it’s supposed to be in standard form

How do i do this using elimination 2x+3y=12 x-y=6

What is the solution set of the quadratic inequality x^2-5< or equal to 0

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible