Transcript Lesson 4

Notes Over 1.4
Check whether the given number is a solution of the equation.
Solution of an equation - when the variable is replaced and
the statement is true.
1. 5 p  2  12; 3 2. 8  2 y  10; 3
53  2  12
15  2  12
13  12
8  23  10
8  6  10
14  10
Notes Over 1.4
Check whether the given number is a solution of the equation.
Solution of an equation - when the variable is replaced and
the statement is true.
3. 3a  2  14; 2
32  2  14
6  2  14
8  14
t
4.
 3  0; 12
4
12
3 0
4
3 3  0
00
Notes Over 1.4
Check whether the given number is a solution of the equation.
Solution of an equation - when the variable is replaced and
the statement is true.
5. n  4n  20; 5
5  45  20
5  20  20
25  20
6. k + 7  3k  1; 3
3  7  33  1
10  9  1
10  10
Notes Over 1.4
Write a question that could be used to solve the equation. Then
use mental math to solve the equation.
7. x + 7 = 21
What number when added by 7 will get 21?
x  14
8. 3 f +1 = 19
What number when multiplied by 3 and then
added by 1 will get 19?
f 6
Notes Over 1.4
Write a question that could be used to solve the equation. Then
use mental math to solve the equation.
9. a  12  10
What number when subtracted by 12 will get
10?
a  22
y
10.
= 11
3
What number when divided by 3 will get 11?
y  33
Notes Over 1.4
Write a question that could be used to solve the equation. Then
use mental math to solve the equation.
11. 4 j  7  9
What number when multiplied by 4 and then
subtracted by 7 will get 9?
j4
b
12.
=4
2
What number when divided by 2 will get 4?
b8
Notes Over 1.4
Check whether the given number is a solution of the inequality.
Solution of an inequality - when the variable is replaced
and the statement is true.
13. 2 f  3  8; 5 14. 2h  4  10; 3
25  3  8
10  3  8
78
23  4  10
6  4  10
2  10
Notes Over 1.4
Check whether the given number is a solution of the inequality.
Solution of an inequality - when the variable is replaced
and the statement is true.
15. 13x  6x  15; 2
132  62  15
26  12  15
26  27
Notes Over 1.4