A straight horizontal line passing through y=-2
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y = -2 is a horizontal line, parallel to the x-axis and 2 units below the x-axis.
For all real values x, there is only one corresponding value of y, -2.
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
1.5
1