Question 565078
y = 2x + 1

    x + y = -2

How do you graph it?
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There are 2 equations, so the question should be, "How do you graph them?"
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Both are straight lines, so you need 2 points.
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y = 2x + 1
Pick 2 values for x and find y.
Plot the 2 points.
Draw a line thru them.
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Do the same for the other equation.