magenxoxo
Please helllppppp!? :D
Which of the below systems of equations matches the following graph?
x – 3y = 9
2x + 3y = 0
x + 3y = –9
2x + 3y = 0
x – 3y = –9
2x – 3y = 0
x + 3y = 9
2x – 3y = 0
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precal
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you sort of need the graphs?
magenxoxo
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I know.. i have one
eclipse18
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Can you post a picture of the graph then I can try to help?
magenxoxo
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yes. one sec! :)
sampatho2
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Just take some points on the graph and substitute them in the equation. Whatever equations satisfy the point are your equations
sampatho2
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satisfy the point in the sense which give 0 on substitution of x and y co-ordinates in the place of x and y
magenxoxo
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I don't know how to get the graph on here :/
magenxoxo
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oh wait! its right there
sampatho2
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they both intersect at (2,3)
so if we substitute these equations in the above equations none satisfy
so none of the equations match the graph
magenxoxo
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hmm.... thats not one of the answers?
sampatho2
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no
magenxoxo
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Well, I'm confused then..
jim_thompson5910
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The point of intersection is (3,2) not (2,3)
sampatho2
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yeah sorry I'm wrong
sampatho2
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in that case the last set is your answer
try substituting 2 and 3 in the place of x and y
magenxoxo
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So, would this be the answer? x – 3y = –9
2x – 3y = 0
sampatho2
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no x+3y=9 (3+3*2=9)
and 2x-3y=o (2*3-3*2=0)
magenxoxo
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ahh. i was going to chose that one