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Quick help with a maths question

y=k(a^x)

points on graph are (1,7) and (3,175)

find k and a

Cheers
(edited 11 years ago)
Reply 1
Original post by joepeat
y=k(a^x)

points on graph are (1,7) and (3,175)

find k and a

Cheers

Have you tried substituting in the two points? Post your working.
Reply 2
so y=k(a^x)

7=k(a^1) or 7=ka

175=k(a^3)

stuck there
Reply 3
Simultaneous equations...

Adding, subtracting, and multiplying probably won't help...but...

Also, note that 175=7*25
Reply 4
ok got ya. cheers

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