On expressing the equation 7x+8y=28 in the general form of a linear equation in two variables ax+by+c=0, the value of c equals .
A
8
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B
-28
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C
28
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Solution
The correct option is B -28 Consider the equation 7x+8y=28. ⇒7x+8y−28=0 Comparing this equation with the general form of linear equation in two variables ax+by+c=0, we get a=7,b=8 and c=−28. Thus, the value of c equals −28.