Oh, dude, graphing y = -x^2 is like the easiest thing ever. You just make a sad parabola that opens downwards because of that negative sign in front of x^2. It's like flipping a smiley face upside down. So, grab your graph paper, plot some points, and voilà, you've got yourself a fancy-looking parabola!
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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, -1, 0, -1, and -4 respectively), plotting them on the graph paper, and roughly sketching the curve that they follow.
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y 2 1 x 0 1 2
If: y = -2 and y = 2/5x-4 Then: x = 5 The lines meet at: (5, -2)
y = -x + 2The graph is a straight line, with [slope = -1], and passing through the point [y=2] on the y-axis.
Y=X^2 is a function for it forms a parabola on a graph.