Depending on the value of the slope or gradient if its the same then they are parallel if its a reciprocal then they are perpendicular.
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No, linear equations don't have x2. Equation with x and y are usually linear equations. Equations with either x2 or y2 (but never both) are usually quadratic equations.
parallel
False. There can either be zero, one, or infinite solutions to a system of two linear equations.
A system of equations may have any amount of solutions. If the equations are linear, the system will have either no solution, one solution, or an infinite number of solutions. If the equations are linear AND there are as many equations as variables, AND they are independent, the system will have exactly one solution.
Equations are not linear when they are quadratic equations which are graphed in the form of a parabola