x - 7\). If the lines are parallel then \({m_1} = {m_2}\) and if \({m_1} = {m_2}\) then the lines are parallel. The gradient of a line which is parallel to the \(y\)-axis cannot be determined from ...

The axis of symmetry, parallel to the y-axis, is an imaginary line passing through the vertex ... and characteristics of the parabola. The x-intercepts reveal where the curve crosses the x ...