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Which of the following are linear equation? (a)15-6=9         (b)2x+5=7   (C)xy+4=1         (d) 4+y=9 Expert Answer

A linear equation in one variable can be written in the form ax +b = c , where a, b, and c are real numbers.

a. 15-6=9
It is not a linear equation, as it doesn't contain a variable with degree 1.

b. 2x+5=7
It is a linear equation , as it is in the form of ax +b = c .

c. xy+4=1
It is not a linear equation, as it doesn't contain a variable with degree 1.
Since  degree of x is 1 and degree of y is 1 = degree of xy is 1 + 1 =2

d. 4+y=9
y + 4 = 9

It is a linear equation , as it is in the form of ax +b = c .
Answered by Yasmeen Khan | 19 Sep, 2018, 12:25: PM
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