Linear and Simultaneous Equations

45.
Given that S = v 2 u 2 2 a ,
(a) Find the value of S when v = 4 , u = 3 and a = 7 .
(a) ......................... [2]
(b) Make v the subject of the formula.
(b) ......................... [2]
Paper 2
46.
(a) Solve:
5 × 2 y = 320
(a) y = ......................... [2]
(b) Solve the simultaneous equations:
b x + y = b
a x y = a
(b) x = ......................... y = ......................... [3]
Paper 2
47.
(a) Make t the subject of the formula:
P = t 3 R
(a) ......................... [2]
(b) Solve:
96 = 3 y 5 4
(b) y = ......................... [3]
Paper 2
48.
Given 4 n 2 m 2 = 171 and 2 n m = 9 .
(a) Calculate the value of 2 n + m .
(a) ......................... [3]
(b) Find the values of n and m .
(b) n = ......................... m = ......................... [3]
Paper 2
49.
p = h q 2 ,
(a) Find the value of p when h = 2 and q = 18 .
(a) ......................... [1]
(b) Make h the subject of the formula.
(b) ......................... [3]
(c) Write a condition for h q so that p is a real number.
(c) ......................... [1]
Paper 2
50.
Solve:
(a) 24 x + 1 = 3
(a) ......................... [2]
(b) 2 p + 3 q = 21
3 p 2 q = 1
(b) p = ......................... q = ......................... [3]
(c) ( 2 t 5 ) ( t + 3 ) = 0
(c) t = ......................... or t = ......................... [2]
Paper 2
51.
(a) T = 6 k m n
(i) Find T when m = 17 , n = 8 and k = 13 .
(a)(i) ......................... [2]
(ii) Make m the subject of the formula.
(a)(ii) ......................... [3]
(b) Find x and y if y = x + 4 3 , and y = 2 x + 1 4 .
(b) x = ......................... y = ......................... [3]
Paper 2
52.
Solve the simultaneous equations:
3 x 2 y = 4
5 x 4 y = 3
x = ......................... y = ......................... [3]
Paper 2
53.
Given that y 4 × y y 3 = y n , find the numerical value of n .
......................... [2]
Paper 2
54.
Solve the simultaneous equations:
5 x + 4 y = 7
7 x + 4 y = 5
x = ......................... y = ......................... [2]
Paper 2
55.
Given that 77 2 67 2 = 5 k , find the value of k .
k = ......................... [2]
Paper 2
56.
(a) Solve for t :
2 t = 4 8 3
(a) t = ......................... [2]
(b) Solve the simultaneous equations:
y = 26 4 x
2 3 y + x = 5 2 3
(b) x = ......................... y = ......................... [3]
Paper 2
57.
Solve the following equations:
(a) 3 x 5 ( 3 x ) = 41
(a) x = ......................... [2]
(b) 2 x + 1 32 = 0
(b) x = ......................... [2]
(c) 2 x + y = 10
7 x 3 y = 9
(c) x = ......................... y = ......................... [3]
Paper 2
58.
Given that T = 2 r p 3 , make p the subject of the formula.
......................... [3]
Paper 2
59.
Solve the simultaneous equations:
2 x + 2 y = 3
4 x 5 y = 24
x = ......................... y = ......................... [3]
Paper 2
26.
Factorise x 2 18 x + 81 .
......................... [1]
Paper 4
27.
1 R = 1 R 1 + 1 R 2
(i) Find R when R1 = 4 and R2 = 6.
R = ......................... [2]
(ii) Make R2 the subject of the formula.
R2 = ......................... [3]
Paper 4
28.
Solve the equation ( 2 x 3 ) ( x 4 ) = 18 .
x = ......................... or x = ......................... [5]
Paper 4
29.
(a) Make p subject of the formula.
2 p + q = k p + 4
p = ......................... [2]
(b) Express as a single fraction in its simplest form.
2 x + 3 6 5 x 3 7
......................... [3]
(c) Solve.
x + 1.5 = 2.5 y
2 y x = 0
x = ......................... y = ......................... [3]
Paper 4
30.
Solve.
(a) 2 x > 39 + 15 x
......................... [2]
(b) 2 x + 1.5 = 2.5 y
2 y x = 0
x = ......................... y = ......................... [3]
Paper 4
31.
(a) Rearrange the formula to make a the subject.
P = y 2 + a y + a
a = ......................... [3]
(b) Factorise fully.
( x 2 y 2 ) ( x y ) 2
......................... [3]
(c) Simplify.
(i) y 2 2 y 2 3 y 2
......................... [3]
(ii) a x a b + b x + b 2 a x 2 a b x
......................... [3]
Paper 4
32.
P = 2 3 m t 2 c
(i) Find the value of P when c = 4, m = 2 and t = −3.
P = ......................... [2]
(ii) Make t the subject of the formula.
t = ......................... [3]
Paper 4
33.
(a) (i) Factorise completely 2 m 2 m 15 .
......................... [2]
(ii) Hence, or otherwise simplify 2 m 2 m 15 4 m 2 25 .
......................... [2]
(b) Given that ( a b ) 2 = 20 and ( a + b ) 2 = 36 , find the value of a 2 + b 2 .
a 2 + b 2 = ......................... [3]
Paper 4
34.
Solve the equations:
(i) 4 5 x 6 = 2 x 8 ,
x = ......................... [2]
(ii) x 2 = 2 x ,
x = ......................... or x = ......................... [2]
(iii) 2 x 2 4 x 3 = 0 , giving your answer to 3 decimal places.
x = ......................... or x = ......................... [4]
Paper 4
35.
(a) Solve the equation.
( 2 x 2 ) ( 6 x + 1 ) = 0
x = ......................... or x = ......................... [2]
(b) Factorise completely.
2 a 2 + 6 a a b 3 b
......................... [2]
(c) Express as a single fraction in its simplest form.
Show all your working.
1 p 2 2 4 p + 3
......................... [3]
Paper 4
36.
(a) Simplify,
( 4 x 2 y 3 ) 4
......................... [2]
(b) Make a the subject of the formula.
p = r a
a = ......................... [2]
(c) Simplify fully.
2 x 2 + 5 x 3 x 2 + 3 x
......................... [3]
(d) Solve x 2 + 5 x 3 = 0 .
x = ......................... or x = ......................... [4]
Paper 4