Question

Q.3) Solve the following equations.
Niu
c) 2x +4x = 7
b) 3x + 11 = 5x - 1
3+8​

Answer 1

Answer:

$a) \: \: \frac{2x + 4}{3 + 8} = \frac{5}{2} \\ \\ = 2(2x + 4 ) = 5 \times 11 \\ \\ = 4x + 8 = 55 \\ \\ 4x = 55 - 8 \\ \\ 4x = 47 \\ \\ = x = \frac{47}{4}$

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$b) \: \: 3x + 11 = 5x - 1 \\ \\ = 11 + 1 = 5x - 3x \\ \\ 12 = 2x \\ \\ x = \frac{12}{2} \\ \\ x = 6$

$c) \: \: 2x + \frac{7}{3} x = 7 \\ \\ = 2x + \frac{7x}{3} = 7 \\ \\ = \frac{6x + 7x}{3} = 7 \\ \\ = 13x = 21 \\ \\ x = \frac{21}{13}$

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