Cambridge International Mathematics

Formulae and simultaneous equations (Chapter 7) 149 EXERCISE 7A 1 The formula for finding the circumferenceCof a circle with rad ...

150 Formulae and simultaneous equations (Chapter 7) 9 Theperiod or time taken for one complete swing of a simple pendulum is giv ...

Formulae and simultaneous equations (Chapter 7) 151 Example 2 Makey the subject of 2 x+3y=12: 2 x+3y=12 ) 2 x+3y¡ 2 x=12¡ 2 x f¡ ...

152 Formulae and simultaneous equations (Chapter 7) 3 Makeythe subject of: a mx¡y=c b c¡ 2 y=p c a¡ 3 y=t d n¡ky=5 e a¡by=n f p= ...

Formulae and simultaneous equations (Chapter 7) 153 3 When a car travels a distancedkilometres in timethours, the average speeds ...

154 Formulae and simultaneous equations (Chapter 7) Example 7 Self Tutor Write a formula for the amount$Ain a person’s bank acco ...

Formulae and simultaneous equations (Chapter 7) 155 6 The perimeter of a polygon is the sum of the lengths of its sides. Write a ...

156 Formulae and simultaneous equations (Chapter 7) Example 10 Self Tutor Makexthe subject of T= a p x . T= a p x ) T^2 = μ a p ...

Formulae and simultaneous equations (Chapter 7) 157 EXERCISE 7D 1 Makexthe subject of: a 3 x+a=bx+c b ax=c¡bx c mx+a=nx¡ 2 d 8 x ...

158 Formulae and simultaneous equations (Chapter 7) 8 According to Einstein’s theory of relativity, the mass of a particle is gi ...

Formulae and simultaneous equations (Chapter 7) 159 In this course we will considerlinear simultaneous equationscontaining two u ...

160 Formulae and simultaneous equations (Chapter 7) g y=3x+2 y=2x+3 h y=3x+1 y=3x+5 i y=5x¡ 2 y=10x¡ 4 2 Find the simultaneous s ...

Formulae and simultaneous equations (Chapter 7) 161 EXERCISE 7E.2 1 Solve simultaneously, using substitution: a y=3+x 5 x¡ 2 y=0 ...

162 Formulae and simultaneous equations (Chapter 7) In problems where the coefficients ofx(ory) arenotthesame sizeoropposite in ...

Formulae and simultaneous equations (Chapter 7) 163 WHICH VARIABLE TO ELIMINATE There is always a choice whether to eliminatexor ...

164 Formulae and simultaneous equations (Chapter 7) Many problems can be described mathematically by apair of linear equations, ...

Formulae and simultaneous equations (Chapter 7) 165 ) 40 x+ 112y= 6960 :::::(3) ¡ 40 x¡ 45 y=¡ 4950 :::::(4) 67 y= 2010 fadding ...

166 Formulae and simultaneous equations (Chapter 7) 5 A visit to the cinemas costsE 64 for a group of 2 adults and 5 children, a ...

Formulae and simultaneous equations (Chapter 7) 167 5 Let A= b b+c . Find the value ofcwhen: a A=2, b=6 b A=3, b=¡ 9 c A=¡ 1 , b ...

Challenge #endboxedheading 168 Formulae and simultaneous equations (Chapter 7) 10 Eric and Jordan were each given$8to spend at a ...