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PLS HELP Thx!

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.