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The slope, or change in y over change in x, would be -2.
The y-intercept would be (0,-3)
Plot the point (0,-3)
Count over one to the right, and two down. Plot another point (1,-5)
Count over one to the right, and two down. Plot another point (2,-7).
Continue doing this, and then connect the points to form a line.
Interpreting that function as y=x2+2x+1, the graph of this function would be a parabola that opens upward. It would be equivalent to y=(x+1)2. Its vertex would be at (-1,0) and this vertex would be the parabola's only zero.
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f(x)=2X-2
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You can do the equation Y 2x plus 3 on a graph. On this graph the Y would equal 5 and X would equal to 0.