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WAEC Mathematics 2007 Question 42

Question 42

Algebraic Expressions

Make w the subject of the relation (a + bc)/(wd + f) = g

  1. A.(a + bc − fg)/dg
  2. B.(a − bc + fg)/fg
  3. C.(a + bc − f)/dg
  4. D.(a + bc − dg)/dg
Show the answer and explanation

Answer: A ((a + bc − fg)/dg)

Explanation

a + bc = g(wd + f) = gwd + fg, so gwd = a + bc − fg and w = (a + bc − fg)/dg.