MCQ
Which of the following equations cannot be formed using the equation $x = 7?$
- A$2x + 1 = 15$
- ✓$7x - 1 = 50$
- C$x - 3 = 4$
- D$\frac{\text{x}}{7}-1=0$
✓
Answer
Correct option: B.
$7x - 1 = 50$
We have, $x = 7$
On multiplying both the sides by $7,$ we get
$7 \times x = 7 \times 7 $
$\Rightarrow 7x = 49$
On adding $(-1)$ both the sides, we get
$7x + (-1) = 49 + (-1)$
$\Rightarrow 7x - 1 = 49 - 1$
$\Rightarrow 7x - 1 = 48$
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