Answer to Question #329414 in Linear Algebra for Shaz

Question

Which of the following is a linear equation in x; y and z?

1. −x−1 + e−

√

2y = 3z, where e = 2.71828 ....

2. 2π ln(e−1

z ) − 2y + z = ln(3) − x.

3.

p

y2 + 4y − 2z = 7x.

4. y + 4y − 2z = 7x−2.

Answer 1

Only fourth equation is a linear one, as only it includes all tree variable as first power terms.