# Simultaneous equationsWatch

Thread starter 7 years ago
#1
How do I solve the following?

For and

I've worked out the following for the second equation:

But I don't know where to go from there. From wolframalpha, I've found the following results: (let b = A and x=x)

I'm expected to find one solution for each, another reason why I'm a little confused because there seem to be multiple solutions from Wolframalpha.

Help would be greatly appreciated.
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7 years ago
#2
If you square both equations

and now you add them

Now you plug in this value into one of the original equations and work out the value for x.
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7 years ago
#3
(Original post by Elbonian)
...
Help would be greatly appreciated.
Well sin and cos are both periodic functions with a period of

And what's as a decimal?
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Thread starter 7 years ago
#4
(Original post by Miss Mary)
If you square both equations

and now you add them

Now you plug in this value into one of the original equations and work out the value for x.
Ah brilliant, thanks.
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7 years ago
#5
I think you can also divide one by the other to get a tanx and the As will cancel
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Thread starter 7 years ago
#6
(Original post by Sternumator)
I think you can also divide one by the other to get a tanx and the As will cancel
I realized that as well, but thanks.
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