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Answers for equations in the form y = mx + b:
1 i y = 2/3
x + 4/3 ii y =
2 x – 1
iii y = -1/2 x + 7/2
2 i y = 3
x – 1 ii y =
7 x + 30
iii y = -4 x + 16 iv y = 2 x +
3
v y = -3/5
x – 3 vi y = 2/3
x – 16/3 vii y = -7/2
x – 7/2 viii y = 3/4
4 i no ii yes
iii yes iv yes
v no vi yes
5 a y = -3/4
x – 3/2 b y = 3/4
x – 5/4 c y = -2/5
x + 1/5
6 a y = 1/2
x + 1 b y = 2/3
x + 2 c y = -2
x + 3 d y = -1/3
x – 2
e y = -1/4
x + 2 f y =
-2/7 x + 41/7
7 a y = 2
x – 3 b y = -3
x – 7 c y = 7/2
x – 39/2
d y = 2
x – 1 e y = 2/3
x – 11/3 f y =
8/3 x + 20/3
8 RS y = -5/3 x + 5 ST y = 3 x –
9 RT y = 1/5
x + 5
9 i y = 3 x – 5 ii y = - 2/5 x + 18/5 iii y = 2 x – 6 iv y
= - 4/3 x + 4
v
y = 3/4 x – 3 vi
y = - 2 x + 5 vii
y = 5/6 x + 5/9 viii y = 2/5 x + 2
10a AB y = 2/3 x + 4 BC
y = - 3/2 x – 9 CD y = 2/3 x – 14/3
DA y = - 3/2 x + 4 AC
y = 5 x + 4
10b BD y = - 1/5 x – 6/5
12 a y = 1/3 x – 2 b
y = 1/3 x + 8 c
y = 1/3 x + 3 d y
= - 3/4 x + 59/13
14b AB y = 2 x CD y = 1/2x EF y
= - 3 x GH y =
- 1/3 x
14c AI y = 1/2 x + 6 CJ y
= 2 x – 12 KL y
= - 1/3 x + 16 MN y =
- 3 x + 48
15 c y = - 5/2 x + 10
16b i y = 3/10 x + 19/10 ii y = 4 x – 27 iii
y = - 3/2 x + 19/2
17a PQ y = 1/2 x – 1 QR y = - 3/4 x + 13/2 PR y = 3 x + 14
17b PQ y = - 2 x – 1 QR
y = 4/3 x + 7/3 PR y
= - 1/3 x + 2/3