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Two equations are given as 5x + 8y = 49 and x = 14 − 3y. The numeric value of 9x + 7y is

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answer is D.

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Detailed Solution

Substituting x = 14 − 3y in the equation 5x + 8y = 49.

5 (14 − 3y) + 8y = 49

y = 3

Substituting y = 3 in x = 14 − 3y, we get x = 5.

Hence, 9x + 7y = 9 (5) + 7 (3) = 66

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