Question

Which of the following is linear equation in two variables?

1. x/3 + 5/y = 6
2. 2x^2 - 3y = 8 - 3y
3. x + 2y = 5 - 3y
4. 3x^2 + y = 0

Answer 1

1 and 3

The other two answer choices have an x squared term which makes those lines quadratics and not linear.

A linear function is one that can be written with a constant multiplied by a variable as shown by

y = mx + b

The x cannot be squared.