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Solve by cross multiplication: 2x − 3y = 9; 4x + 9y + 2 = 0. |
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Answer» Answer: (x, y) = ( 5/2, -4/3) Step-by-step explanation: MULTIPLY equation (i) by 3 and add to equation (ii) 4x + 9y = -2 ... eq (ii) 10x = 25 ⇒ x = 25/10 = 5/2 ∴ y = (-2 - 4x)/ 9 = (-2 -10 )/9 = -12/9 = -4/3 (x, y) = ( 5/2, -4/3) |
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