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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, -1)
y equals x-4 plus 2 is the same as y = x-2. You just translate the graph of y=x, 2 units to the right, OR 2 down.
y=x+1 there for answer is 2
y=xsquared-4x+2
you put the y intercept at 2, the x intercept at -2/3 and you join those two points.
y=b+x+x^2 This is a quadratic equation. The graph is a parabola. The quadratic equation formula or factoring can be used to solve this.