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Math Problem Answered

What will be the equation for y for the following graph?

y=5, x=0
y=4, x=1
y=3, x=2
y=2, x=3
y=1, x=4
y=0, x=5

Discussions

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steveastrouk
steveastrouk

Best Answer 6 years ago

What shape do you think its going to be ?

Take a piece of graph paper and plot it. There are of course programs that can do it, but your won't learn much that way.

Find the points at which the line intersects the axes.

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Wisaam
Wisaam

Answer 6 years ago

The line intersects the 'x' axis at point (5,0) and intersects the 'y' axis at point (0,5). I have already made the graph and 'y' is inversely proportional to 'x' but I can't come up with an equation for 'y'. The graph is like straight line going from top to down.

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steveastrouk
steveastrouk

Answer 6 years ago

RiGHT.
This is a linear function, which has the form Y=MX+C, where M is the gradient and C is the Y offset.

Set X=0 Y=C. So that you can find from the answers you have.

Now, set Y=0, and rearrange the equation to give you "M". Substitute the values you already have.

This is stuff we did when we were about 12 in the UK when I was younger.

Steve

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Wisaam
Wisaam

Answer 6 years ago

Sorry I didn't understand a bit of it, what will be the value of M?

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steveastrouk
steveastrouk

Answer 6 years ago

That's what you have to calculate from the numbers you have.
Alternatively, go away and study the equation of the straight line. Look at the maths I showed you, with the Y=MX+C Play with some numbers into it, say M=0.5, C=1, X=0...5 Repeat for M=1, 2 etc

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Wisaam
Wisaam

Answer 6 years ago

Thanks a lot. It worked, but I have a question here, why can't we use proportionality here,

as y is inversely proportional to x,
so y=m/x + c

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steveastrouk
steveastrouk

Answer 6 years ago

WELL DONE ! Great work. Now you know a little bit more about maths.
In answer to your other question:

Plot it. Y=1/X is NOT linear !

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Wisaam
Wisaam

Answer 6 years ago

Here is another question. Please answer it too in an understandable way like you did here.

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steveastrouk
steveastrouk

Answer 6 years ago

PS Don't forget to select the best answer.

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steveastrouk
steveastrouk

Answer 6 years ago

Y=MX+C

Let Y = 0

0=MX+C

C is known. X, when Y =0 is known. Calculate M

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Kiteman
Kiteman

6 years ago

If you find your homework difficult, you ought to talk to your teacher about it first.

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Wisaam
Wisaam

Answer 6 years ago

Actually it's not homework. It's not even related to any of the chapters I study in school.