Question 145855
graph the following functions: 
f(x)= -3x +7
You need two points to graph a line:
Let x = 0, then y = 7
Let x = 1, then y = 4
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Plot the points (0,7) and (1,4)
Draw a line thru them to get:
{{{graph(400,300,-10,10,-10,10,-3x+7)}}}
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f(x)= -3x^2 + x - 5
You need three points to graph a parabola:
Let x = 0, then y = -5
Let x = 1, then y = -7
Let x = -1, then y = -9
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Plot the three points and draw a parabola thru them opeing downward:
{{{graph(400,300,-10,10,-10,10,-3x^2+x-5)}}}
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Cheers,
Stan H.