A level maths help! Watch

TaySwiftie13
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Hi
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Muttley79
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(Original post by TaySwiftie13)
Hi, if you have two exponential equations in the form y=ab^t and are given 2 values for y, how do you work out the value of the constants a and b? Thanks
Can you give an example we can help you with?
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Muttley79
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Thanks for your message:

Example: If y=ab^t , where y is the value of a car in 2001. the value in 2005 was 32000 and in 2012 the value is 50000? find p and a

So what have you tried?
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Muttley79
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(Original post by TaySwiftie13)thaks for replying, I tried setting 32000=Ab^4 and 50000=Ab^11 and then got stuck. I tried to divide 50000/32000 and then get p^7 but i think im way off!
So how can you get p from that?
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TaySwiftie13
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done it thank you!
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casperyc
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(Original post by TaySwiftie13)
Hi, if you have two exponential equations in the form y=ab^t and are given 2 values for y, how do you work out the value of the constants a and b? Thanks
You can **DIVIDE** the two equations to cancel a to start with, which will give you b.
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