On expressing the equation $7 x + 8 y = 28$ in the general form of a linear equation in two variables $a x + b y + c = 0,$ the value of $c$ equals .

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-28

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Solution

The correct option is B -28
Consider the equation $7 x + 8 y = 28.$
$\Rightarrow 7 x + 8 y - 28 = 0$
Comparing this equation with the general form of linear equation in two variables $a x + b y + c = 0,$ we get
$a = 7, b = 8$ and $c = - 28.$
Thus, the value of $c$ equals $- 28.$

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