Posted by **Kara** on Saturday, October 20, 2012 at 2:50pm.

2a + 7b + 17c = 31 How do you work out what a,b and c are?? any help would be appriciated

- math -
**Steve**, Saturday, October 20, 2012 at 3:11pm
without more info, there's no way to assign a specific value to any of them.

Just pick any value for c, cay c=1

then you have

2a+7b +17 = 31

2a+7b=14

Now, you can pick a=7, and then b=0

or you can pick b=2 and then a=0

or, you can pick a = -7, and then b=4

and so on. In general, if you have three variables, you will need three separate equations which must all be satisfied to determine unique values for the variables.

- math -
**Kara**, Saturday, October 20, 2012 at 3:15pm
Thanks for the pointer Steve! I'll try that :)

## Answer this Question

## Related Questions

- English - Can anyone tell me where in King Lear does GLoucester find out that ...
- Physics - waves propagate down a 25gram string at 35 m/s. If the string has a ...
- Math - C^2+17c+16
- Math - Can someone please help me figure out the mean, standard deviation, raw ...
- Math - How would you solve a problem like this with logarithims? I tried to ...
- Math - I don't understand this it says If the average of 6 numbers was 58, what ...
- Geography - A Day Without Farming? This is for Geography. I have to hand in one ...
- Algebra - Quick Question, when would an inequality like this work: x^2 - 4x >...
- Algebra - Quick Question, when would an inequality like this work: x^2 - 4x >...
- Math - Is there a case when you might prefer algebraically over graphically ...

More Related Questions