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5. Linear Equations in Two Variables
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1) If 8x +7y = 11 and 7x + 8y = 4, then what is the value of x + y?
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2) If 12x + 17y = 48 and 17x +12y = 68 ,then what is the value of x - y?
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3) Which of the following is not a linear equation ?
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