Using the property of equality, you simplify it to y=x, which is pretty straightforward. When y=1, x=1. When y=2, x=2. When y=3 xe3. and so on. Then u connect the points, and voila
That is a straight line emanating from the origin in both direction. X = 1 and Y = 1 X = 2 and Y = 2 X = -1 and Y = -1 X = -2 and Y = -2 as you can see you have a line splinting the first and third...
The coodinates for x+y = 2 are (2,0) and (0, 2)The coordinates for x-y = 4 are (4, 0) and (0, -4)Plot the coordinates on graph paper and join them up with straight lines they should intersect at (3,...
This would be an upside-down parabola, with it's apex being at {0,0}. You can graph it by taking a few values of x (-2, -1, 0, 1, and 2 would be enough), finding their corresponding y positions(-4,...