Simplify 3^-9 / 3^-12. 1/3^3 1/3^21 3^3 3^21

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Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)