# Math Problem

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

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4 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.
Wisaam (author)  steveastrouk4 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.
4 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
Wisaam (author)  steveastrouk4 years ago
Sorry I didn't understand a bit of it, what will be the value of M?
4 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

Wisaam (author)  steveastrouk4 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
4 years ago
WELL DONE ! Great work. Now you know a little bit more about maths.

Plot it. Y=1/X is NOT linear !
Wisaam (author)  steveastrouk4 years ago
Here is another question. Please answer it too in an understandable way like you did here.
4 years ago
PS Don't forget to select the best answer.
4 years ago
Y=MX+C

Let Y = 0

0=MX+C

C is known. X, when Y =0 is known. Calculate M
Kiteman4 years ago