Algebra is the branch of mathematics that focuses on formulas, and one of its key concepts is the representation of linear equations, which describe straight lines. Among the various forms you can ...

The use of proton gradients gives an insight not only into how life got going in the first place, but also, perhaps, its deepest stalling point: the evolution of complex eukaryotic (nucleated ...

They are parallel. B and D have the same gradient. For each unit of horizontal movement to the right the vertical movement is 1 (1 up). They are parallel. Choose two points on the line.

You need both a point and the gradient to find its equation. You are usually given the point - it's where the tangent meets the circle. To find the gradient use the fact that the tangent is ...