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Simultaneous Equation

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Solve by substitution method: x + y = 7 2x - 3y = 9

x = 6, y = 1

Solve by substitution method: 11y + 15x = -23 7y - 2x = 20

x = -3, y = 2

Solve by equating coefficients method: x + 2y = -4 3x - 5y = -1

x = -2, y = -1

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