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What is the solution to the system of the equations? x = y - 3 x + 3y = 13

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?

For the equations below which statement is true ? -2x=14 6x=-42