Please answer it was multiple choice questions Numbers 2 and 12 I need I today please answer it correctly and please show work please

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

How do you use the elimination method for this question? explain, because i really want to understand!