Solve a+b=3a

$$a + b = 3 a$$

Solve for a

$$a=\frac{b}{2}$$

Steps for Solving Linear Equation

Subtract 3a from both sides.

$$a+b-3a=0$$

Combine a and -3a to get -2a.

$$-2a+b=0$$

Subtract b from both sides. Anything subtracted from zero gives its negation.

$$-2a=-b$$

Divide both sides by -2.

$$\frac{-2a}{-2}=-\frac{b}{-2}$$

Dividing by -2 undoes the multiplication by -2.

$$a=-\frac{b}{-2}$$

Divide -b by -2.

$$a=\frac{b}{2}$$

Solve for b

$$b=2a$$

Solution Steps

Subtract a from both sides.

$$b=3a-a$$

Combine 3a and -a to get 2a.

$$b=2a$$