Book Maths Puzzle Algebra

Solve system of equation (for x and y coordinate): 4x-5y=3 -3x+4y=19

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Solve system of equation (for x and y coordinate): 7x-2y=12 x=.5y+3 How do I find the value of variables in radical form given the value of one angle and one side in a triangle? Example a right triangle with one angle of 30 and the length of the a