B. 3 / 3
ExplanationSubstituting y = x + 1 gives 3x + 4x + 4 = 25 so 7x = 21 and x = 3.
y = x + 1 रखने पर 3x + 4x + 4 = 25 इसलिए 7x = 21 और x = 3।
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