Question

Tell whether the equation x(x+4)-x2+3y+5=0 is a linear equation in 2 variables or not.

Answer 1

X(X+4)-X^2+3y+5=0 is a linear equation because
x^2+4x-x^2+3y+5=0
x^2-x^2+4x+3y+5=0
4x+3y+5=0. (x^2-x^2=0)
Hence 4x+3y+5 is a linear equation