Explanation:
firstly in equation y= 2x+6 suppose the value of y as zero and find the value of x. again suppose the value of x as 0 and find the value of y. Do the same for other equation as well and you get two values of X and y.
Also find the slope of each equation by the formula :
slope= - coefficient of x / coefficient of y. and solve by plotting the points according to the slope.