Respuesta :

Answer:

[A] m = 15

[B] x = 13

[C] b = 1

[D] x = 13

Explanation:

  • 21 = m + 6

Switch sides:

m + 6 = 21

Subtract 6 from both sides:

m + 6 - 6 = 21 - 6

Simplify:

m = 15

  • 4 = x − 9

Switch sides

x - 9 = 4

Add 9 to each side:

x - 9 + 9 = 4 + 9

Simplify:

x = 13

  • b − 17 = −16

Add 17 to each side:

b - 17 + 17 = -16 + 17

Simplify:

b = 1

  • −4 = x − 17

Switch sides:

x - 17 = -4

Add 17 to each side:

x - 17 + 17 = -4 + 17

Simplify:

x = 13

- PNW

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