Substitution

Substitution

By Patsy McCaffrey

^{​RE-CAP - You need to know}

​Your Turn

Multiple Choice

Work out the value of the following expressions

a + b

when a = 3, b = 4
 

• 7
• 8
• 9
• 6

Match

If a = 12, match the values for these equations

• 2a

• a + 4

• $$\frac{a}{3}$$

• $$a^2$$

24

16

4

144

• 24

• 16

• 4

• 144

Multiple Choice

Work out the value of the following expressions

2a

when a = 3, b = 4

• 5
• 6
• 8
• 10

Multiple Choice

Work out the value of the following expressions

3ab

when a = 3, b = 4

• 10
• 12
• 15
• 36

Multiple Choice

Work out the value of the expression

y + x - z

when x = 3, y = – 2 and z = 4.

• -5
• -3
• 3
• 5

Multiple Choice

Work out the value of the expression

2xz

when x = 3 and z = – 4.

• 1
• 24
• -24
• 9

Multiple Choice

If a = 4 and b = 6

what is the value of 3a + 5b?

• 40
• 42
• 44
• 46

Multiple Choice

If x = 5,

find the value of 7x - 1.

• 34
• 36
• 35
• 37

Multiple Choice

If a = 4 & b = 6,

what is 3a + 5b?

• 40
• 42
• 44
• 46

Multiple Choice

Work out the value of the expression

when x = 3, y = – 2

• 1
• -1
• 1/5
• -6

Multiple Choice

If y = 7

find the value of 2(y+4)

• 11
• 22
• 20
• 18

Multiple Choice

T = 2x + 3y

Work out the value of y

When T = 16 and x = 5

• 2

• 3

• 4

• 5

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