Solve 4x-y=42

$$4 x - y = 42$$

Solve for x

$$x=\frac{y+42}{4}$$

Steps for Solving Linear Equation

Add y to both sides.

$$4x=42+y$$

The equation is in standard form.

$$4x=y+42$$

Divide both sides by 4.

$$\frac{4x}{4}=\frac{y+42}{4}$$

Dividing by 4 undoes the multiplication by 4.

$$x=\frac{y+42}{4}$$

Divide 42+y by 4.

$$x=\frac{y}{4}+\frac{21}{2}$$

Solve for y

$$y=4x-42$$

Steps for Solving Linear Equation

Subtract 4x from both sides.

$$-y=42-4x$$

Divide both sides by -1.

$$\frac{-y}{-1}=\frac{42-4x}{-1}$$

Dividing by -1 undoes the multiplication by -1.

$$y=\frac{42-4x}{-1}$$

Divide 42-4x by -1.

$$y=4x-42$$