Asked by zumai
                PLEASE HELP ASAP!!!!!
i don't know!
Explain how to write a function rule from the table below. Then write a function rule.
x: 2 4 6
y: 1 0 –1
i know its so simple but im having so much trouble!!!:(
pls help!
            
        i don't know!
Explain how to write a function rule from the table below. Then write a function rule.
x: 2 4 6
y: 1 0 –1
i know its so simple but im having so much trouble!!!:(
pls help!
Answers
                    Answered by
            Damon
            
    well, try a parabola since we have three points
y = a x^2 + b x + c
1 = a (4) + b (2) + c
0 = a (16 ) + b(4) + c
-1 = a(36) + b(6) + c
subtract second from first
1 = -12 a -2 b
subtract third from second
1 = -20 a -2 b
subtract
0 = 8 a
a = 0, this is a straight line
1 = -2 b
b = -1/2
-1 = 6 b + c
-1 = -3 + c
c = 2
so in the end
y = -(1/2) x + 2
    
y = a x^2 + b x + c
1 = a (4) + b (2) + c
0 = a (16 ) + b(4) + c
-1 = a(36) + b(6) + c
subtract second from first
1 = -12 a -2 b
subtract third from second
1 = -20 a -2 b
subtract
0 = 8 a
a = 0, this is a straight line
1 = -2 b
b = -1/2
-1 = 6 b + c
-1 = -3 + c
c = 2
so in the end
y = -(1/2) x + 2
                    Answered by
            Damon
            
    Of course if we had sketched a graph, we would have seen a straight line and not have bothered with the parabola :)
    
                    Answered by
            zumai
            
    i got what you had
thank you Damon!:)
    
thank you Damon!:)
                    Answered by
            Damon
            
    You are welcome :)
    
                    Answered by
            value
            
    evaluate 86.5-13.5
    
                    Answered by
            Amanda Thripp
            
    Thank you Damon AGAIN! You're a LEGEND.
    
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