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4 years ago

PLEASE HELP

Mathematics

2 answers:

Tju [1.3M]4 years ago

7 0

Answer:

4) x = 11

5) x = -6

6) x = 18

7) x = 21

Step-by-step explanation:

(the equations and the answers are bolded)

x + 9 = 21

<em>subtract 9 from both sides of the equation</em>

x + 9 - 9 = 21 - 9

x = 21 - 9

x = 11

21 - x = 27

<em>add x to both sides</em>

21 - x + x = 27 + x

21 = 27 + x

<em>subtract 27 from both sides</em>

21 - 27 = 27 - 27 + x

-6 = x

21 = x + 3

<em>subtract 3 from both sides</em>

21 - 3 = x + 3 - 3

21 - 3 = x

21 - 3 = 18

18 = x

x - 9 = 12

<em>add 9 to both sides</em>

x - 9 + 9 = 12 + 9

x = 12 + 9

x = 21

Ira Lisetskai [31]4 years ago

3 0

Answer:

5. 27 + 21 = 48

6. 21 - 3 = 18

7. 12 + 9 = 21

Step-by-step explanation:

I could only see these three but I hope this helps :)

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