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How do you work out b plus 9 equals 21?

Updated: 9/17/2023

Wiki User

∙ 14y ago

Best Answer

b + 9 = 21

Take the + 9 across the other side of the equals sign. a plus becomes a minus.

b = 21 - 9

so...

b = 12.

This can be checked by setting b to 12 in the first equation

b + 9 = 21

12 + 9 = 21

which is correct.

Wiki User

∙ 14y ago

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What is 12 plus 9 equals?

12 plus 9 equals 21.

Solve a plus 9 equals 21?

A + 9 = 21 A = 21 - 9 A = 12

What Is 9 plus x equals 21 for x equals 11?

x â&permil;  11 9 + x = 21 9 + x - 9 = 21 - 9 x = 12

What is the answer for x plus 9 plus 5x equals 21 plus 2x?

If: x+9+5x = 21+2x Then: x = 3

Why do people say 9 plus 10 equals 21?

9+10 =21 is sated from a popular vine

Related questions

What is 12 plus 9 equals?

12 plus 9 equals 21.

Solve a plus 9 equals 21?

A + 9 = 21 A = 21 - 9 A = 12

What is 9 plus 5 plus 7 equals?

21

5 plus 7 plus 9 equals?

21

What Is 9 plus x equals 21 for x equals 11?

x â&permil;  11 9 + x = 21 9 + x - 9 = 21 - 9 x = 12

What is the answer for x plus 9 plus 5x equals 21 plus 2x?

If: x+9+5x = 21+2x Then: x = 3

Can you mathematically prove 9 plus 10 equals 21?

No you can not prove that 9 +10 = 21.

What is the answer to the equation 2x plus 3 equals 9 x equals?

21

9 plus ten equals 21?

No, because 9+10 = 19

Why do people say 9 plus 10 equals 21?

9+10 =21 is sated from a popular vine

What is the answer for -x plus 12 equals -9?

3

What is5x plus 9 equals 7x plus 21?

-2x = 12 so x = -6 giving -30 + 9 = -42 + 21. Both sides = -21.

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