Solve the formula 3a – 4b = c for b.

Question

solomonzelman · Answer

$$3a-4b=c$$$$3a-4b\color{red} {-3a}=c\color{red} {-3a}$$$$-4b=c-3a$$what would be your last step?

anonymous · Answer

i have no clue i never done these:(

solomonzelman · Answer

ok, it asks you to solve for b, or to set the equation the following way$$b=....$$whatever it would be equal to.
You have to eliminate b with it's coefficient from other variables and then divide both sides by the coefficient of b
you will get (again)$$b=....$$

solomonzelman · Answer

See what I did till now?

anonymous · Answer

im still lost i never did these kind of problems

solomonzelman · Answer

Alright, lets do different examples then.

Solve for d
$$2x+d=c$$
eliminate d from other variables.
$$2x+d\color{red} {-2x}=c\color{red} {-2x}$$preform this subtraction.$$d=c-2x$$see?