<p> Cambridge Essentials Mathematics Core 9 A3.2 Answers</p><p>A3.2 Answers</p><p>1 a £4.80 b £8.00 c £16.00 d £1.20</p><p>2 a £9.98 b £59.88 c £179.64 d £499</p><p>3 x 1 2 3 4 5 6 y 0.5 1 1.5 2 2.5 3</p><p> x x a x → b y = 2 2</p><p> c</p><p>Original Material © Cambridge University Press 2010 1 Cambridge Essentials Mathematics Core 9 A3.2 Answers</p><p>4 a 27.6 litres b 515.2 litres c 6.9 litres</p><p>5 a £17.63 b £21.53 c 18.6 metres</p><p>6 a Yes. When x increases by 1, y increases by 7. </p><p> b Yes. When x increases by 1, y increases by 2.5.</p><p> c No. When x increases by 8, y increases by 1, except for when x is 10.</p><p>7 a Number of Swiss francs = 2.06  number of pounds Sterling (or f = 2.06p)</p><p> b</p><p>Pounds 1 2 5 10 40 60 Swiss francs 2.06 4.12 10.3 20.6 82.4 123.6</p><p> c £50 d £25.24 e 72.1 Swiss francs f 2 060 000 Swiss francs</p><p>8 a </p><p> k 0 4 8 12 16 20 m 0 2.5 5 7.5 10 12.5</p><p>Original Material © Cambridge University Press 2010 2 Cambridge Essentials Mathematics Core 9 A3.2 Answers</p><p> b</p><p> c 6 kilometres d 6 miles</p><p>9 c: p is not in direct proportion to q.</p><p>10 a y-value increases by 4 each time b y = 4x </p><p>11 (3, 4), (5, 19)</p><p>1 3 12 a y = 2x b y = x c y = x 2 2</p><p>13 a y = 5x b 45 c 17 d 6 e 2.4</p><p> q 14 a p = b 8 c 6.4 d 28 e 15 2</p><p>15 a y = 10x b 14 c 2.5</p><p>Original Material © Cambridge University Press 2010 3 Cambridge Essentials Mathematics Core 9 A3.2 Answers</p><p> d y = 10x e Students’ checking of answers</p><p>Original Material © Cambridge University Press 2010 4</p>