Question

Which of the following is a linear equation in one variable?

(i) $x^2=5$

(ii) $x+y=4$

(iii) $x+6=9$

(iv) $x^2+y^2=9$ [4 MARKS]

Answer 1

Answer with reason : 1 Mark each

(i) $x^2=5$ is not a linear equation, since the highest exponent on the variable is 2.

(ii) $x+y=4$ has two variables in it

(iii) $x+6=9$ is a linear equation in one variable

(iv) $x^2+y^2=9$ has two variables in it, and the highest exponent is 2