Question:
Which of the following is a linear expression?
(a) $x^{2}+1$
(b) $y+y^{2}$
(c) 4
(d) $1+z$
Solution:
(d) We know that, the algebraic expression in one variable having the highest power of the variable as 1, is known as the linear expression.
Here, 1 + z is the only linear expression, as the power of the variable z is 1.
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