# A level maths help!Watch

#1
Hi
Last edited by TaySwiftie13; 3 days ago
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5 days ago
#2
(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
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5 days ago
#3

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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5 days ago
#4
(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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#5
done it thank you!
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5 days ago
#6
(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 to start with, which will give you .
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