The first thing to immediately recall is that parallel lines have the same gradient. in the equation of a line (which is expressed in the y=mx+c format), the gradient (m) is the coefficient of x. Note: if the equation is expressed in a different format, it has to be brought back into the y=mx+c format, before the y-intercept or gradient can be determined. For example, if the equation is given is 4y-2x+3=0, then rearrange the equation so that 4y=2x-3, and then divide all the terms by the coeffiecient of y, so that we are left with y=0.5x-0.75. NOW, our gradient is the coefficient of x. The gradient of L1 = gradient of L2 = 2 (Parallel lines) and we also know that L2 passes through the point (0,3) Substitute the following values into y=mx+c y=3 x=0 m=2 c=? and we get c=3, so the equation of L2 is: y=2x+3