alleryWhich of the following is a linear equation in one variable?
A$x^2+1=3$
B$2x-5=9$
C$\frac{1}{x}=4$
D$x^3-2=0$
Answer & Solution
Correct answer: B. $2x-5=9$
A linear equation in one variable has the variable with maximum power 1. In $2x-5=9$, the highest power of $x$ is 1, so it is linear.
The other options are not linear because they involve $x^2$, $1/x$, or $x^3$.
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