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The slope. The gradient of a straight line is the number of co-ordinates on the y axis to one co-ordinate on the x axis.
Theoretically, yes. For lines parallel to y-axis, gradient is zero. Eg, x=4.
The slope (or gradient) if the line is parallel to the y-axis, is infinite. If it's parallel to the x-axis the slope is zero.
First the formula is g(x)=ax2+bx+c First find where the parabola cuts the x axis Then find the equation of the axis of symmetry Then
It is a straight line. The line intersects the y-axis at (0, -4); the x-axis at (6, 0) and has a gradient (slope) of 2/3