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7th Class Mathematics Simple Equations Question Bank Simple Equation

  • question_answer
    Form an equation of the form \[ax+b=c,\]where a, b and c are constants, such that the solution of the equation is x = 4.

    A)  \[2x+5=15\]             

    B)         \[7x+2=10\]             

    C)         \[5x+4=16\]             

    D)         \[3x+4=16\] 

    Correct Answer: D

    Solution :

    (a) \[2x+5=15\Rightarrow 2x=10\,\Rightarrow x=5\] (b) \[7x+2=10\,\,\Rightarrow 7x=8\Rightarrow x=\frac{8}{7}\] (c) \[5x+4=16\Rightarrow 5x=12\Rightarrow x=\frac{12}{5}\] (d) \[3x+4=16\Rightarrow 3x=12\Rightarrow x=4\]


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