Please help i don't understand this

solve the system of equations algebraically. round to the nearest tenth, if necessary.

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Which rectangle if translated 6 units right and 16 units down and the rotated 90° clockwise about the point (4, -11) will result in rectangle e?

Which ordered pair is a solution of the equation? 2x+3y=10