Page 89 - Mathematics

(Add 8 on both sides) Solution
x = 16 2x− + 8 Given 3x +=
3 12.
x + 2x = 24 2x− + 2x 2
(Add 2x on both sides) Subtract 3 from both sides of the
3x = 24 equation get,
Divide by 3 on both sides of the 3x +− − Tanzania Institute of Education
3 3 12 3=
equation to get, 2
3x
24 2 = 9
x =
3 Multiply both sides of the equation
= 8 by 2 to get,

Therefore, x = 8.
3x ×= 92×
2
2
Example 5.18 3x = 18
Divide by 3 on both sides of the
57
Find the value of y if 3y −= equation to get,
18
Solution x = 3
5 7.
Given 3y −= 6
Add 5 on both sides of the equation =
6
to obtain, Therefore, x = .

55 7 5= +
3y −+ Example 5.20
3y = 12
Dividing by 3 on both sides of the Solve for the value of z if
equation gives, 5
3 y = 12 3 (3z − 2) 10.=
3 3 Solution

y = 4 5
Therefore, y = 4. Given (3z − 2) 10.=
3
Multiply by 3 on both sides of the
equation. That is,
Example 5.19
3× 5 (3z − 2) = 3 10×
Solve for the value of x in the equation 3 Mathematics Form One
3x += 5(3z − 2) 30=
3 12.
2

83

25/10/2024 09:51:26
Mathematics form 1.indd 83 25/10/2024 09:51:26
Mathematics form 1.indd 83