It is the linear equation of a straight line.
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Yes.
It is a quadratic equation in the variable x.
No. It is a linear equation (y = 5/2 x + 5). A quadratic equation requires a squared term, for example y = x2 + 5x + 6; this can be solved for x given y = 0, as in solving x2 + 5x + 6 = 0.
It has no solutions because the discriminant of the quadratic equation is less than zero.
The question contains two equations:5x - 6y = 15 5x + y = 2 There are no inequalities in the question.