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Solve the following Simple Equations:

 (i) 6m = 12

 (ii) 14p -42 

(iii) -5y = 30 

(iv) – 2x = – 12

(v) 34x = – 51 

(vi) n/7 = -3 

(vii) 2x/3  = 8 

(viii) 3x+1 = 16 

(ix) 3p – 7 = 0

(x) 13 – 6n = 7 

(xi) 200y – 51 = 49 

(xii) 11n + 1 = 1 

(xiii) 7x – 9 = 16

(xiv) 8x + \(\frac52\) = 13

(xv) 4x – \(\frac53\) = 9 

(xvi) x - \(\frac43\) = 3\(\frac12\)

1 Answer

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i) 6m = 12 ⇒ m =\(\frac{12}{6}\) ⇒ m = 2

ii) 14p = – 42p ⇒ P = \(\frac{-42}{14}\)

∴ p = -3

iii) -5y = 30 ⇒ y = \(\frac{30}{-5}\) = -6 

∴ y = -6

iv) -2x = -12 ⇒ 2x = 12 

x = \(\frac{30}{-5}\) = 6 

∴ x = 6

v) 34x = -51

\(\frac{-3}{2}\)\(\frac{-3}{2}\)

∴ x = \(\frac{-3}{2}\)

vi) \(\frac{n}{7}\) = -3 

⇒ n = -3 x 7 = -21 

∴ n = -21 

vii) \(\frac{2x}{3}\) = 18 ⇒ 18 x \(\frac{3}{2}\) = 27 

∴ x = 27

viii) 3x + 1 = 16 

3x = 16 – 1 = 15 

3x = 15

x = \(\frac{15}{3}\)

∴ x = 5

x) 3p – 7 = 0 

⇒ 3p = 7 

∴ p = \(\frac73\)

x) 13 – 6n = 7 

⇒ -6n = 7 – 13 

⇒ -6n = -6 ⇒ n= \(\frac{-6}{-6}\)

∴ n = 1

xi) 200y – 51 = 49 

⇒ 200y = 49 + 51 

⇒ 200y = 100 

⇒ y = \(\frac{100}{200}\)

∴ y = \(\frac12\)

xii) 11n + 1 = 1 

⇒ 11n = 1 – 1 

= 11n = 0

⇒ n = \(\frac0{11}\) = 0 

∴ n = 0

xiii) 7x – 9 = 16 

⇒ 7x = 16 + 9 

⇒ 7x = 25 

∴ x = \(\frac{25}7\)

xiv) 8x + \(\frac52\)  = 13

xv) 4x – \(\frac53\) 

xvi) x + \(\frac43 =3\frac12\)

⇒ \(x\,+ \frac43=\frac72\)

⇒ \(\frac72\,-\,\frac43=\frac{21\,-\,8}{6}\)

∴ x = \(\frac{13}6\)

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