2. here is a linear equation in two variables: 2x + 4y - 31 = 123.
solve for x: 2x + 4y - 31
123
solve for y: 2x + 4y - 31 = 123

Part 1)

Part 2)

Step-by-step explanation:

we have

Part 1) Solve for x

That means -----> isolate the variable x

Subtract 4y both sides

Adds 31 both sides

Divide by 2 both sides

Part 2) Solve for y

That means -----> isolate the variable y

Subtract 2x both sides

Adds 31 both sides

Divide by 4 both sides