Respuesta :

You have to us certain properties of equality to solve the equation ab-c = 9. 

In order to solve for c, find a way to isolate it from the other constants or variables inside the equation.

By additive property:
c+ab-c = 9 +c

Transpose the constant 9:
c = ab-9

Therefore, c is equal to ab - 9

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Answer:

The equation involving three variable and one constant is

  a b - c = 9

Adding , c on both sides

→ a b - c + c = 9 +c

→ a b = 9 + c

Subtracting ,9 from both sides

→a b -9 = 9 +c -9

→a b - 9 = c + 9-9→ [ Used associative property of addition, (a + b)+c=b +(a+c)]

→ a b -9 =c

c= a b - 9

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