Y = mx + c. m = the gradient : i.e. The slope c = the y intercept, (where the line passes through the y axis) The slope (gradient/) = 2 So now you have y = 2x + c You have also been told that the y intercept is 1 So now you have the equation : y = 2x + 1 The line on a graph goes up, as the gradient is positive. It is also a straight line as the x has a indices of 1.