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## #1 2006-04-07 23:31:10

Math Student
Guest

### Changing The subject of A formula

Hello,

I was wondering how you do this, I think I've got them right, but i will just post them to check! ^_^

In Questions 1 to 12 make x the subject.
1. x - a = e
2. x + t = h
3. a + b = x - g
4. v + x = m2
5. h + x = 2h + n
6. s - t = t + x
7. x - y2 = y
8. x - pq = m
9. n = x - mn
10. ax = c
11. mx + c = y
12. bx = a + c
In Questions 13 to 24 make y the subject.
13. my - c = n
14. 5b = ay + b
15. a + c = ky - c
16. e + d = b + cy
17. t2 + ty = p2
18. ay - z = z
19. - m = fy
20. pqy = πr2
21. aby = m + n
22. c2 + d2y = a2
23. mty + c = d
24. xyz - p2 = q2

In Questions 25 to 36 make the letter in brackets the subject.

25. a + tb = e [t]
26. ab + kn = a2 [k]
27. n + mw = 2n    [w]
28. s(y + a) = b [y]
29. p(a + x) = b [x]
30. z(c + d) = e    [z]
31. m(r + s) = t  [m]
32. b = a(m + n) [n]
33. b2 = w(y - a) [y]
34. s = (u + v)t  [u]
35. m2(a + e) = n2 [e]
36. ab(a + x) = c    [x]

37. n = π (2r + h)
Make h the subject
38. t2 = z(a + c + d)
(a) Make c the subject
(b) Make z the subject.
39. (y + z)m = c + d
(a) Make m the subject
(b) Make y the subject

## #2 2006-04-08 00:18:33

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,054

### Re: Changing The subject of A formula

1. x = e+a
2. x = h-t
3. x = a+b+g
4. x = m2-v
5. x=h+n
6. x=s-2t
7. x = y+y2
8. x=m+pq
9. x=n+mn
10. x=c/a
11.x= (y-c)/m
12. x= (a+c)/b

13.y= (n+c)/m
14. y=4b/a
15.y= (a+2c)/k
16. y= (e+d-b)/c
17. y= (p2-t2)/t
18. y=2z/a
19. y=-m/f
20. y=πr2/pq
21. y= (m+n)/ab
22. y= (a2-c2)/d2
23. y= (d-c)/mt
24. y= (p2+q2)/xz

25.t= (e-a)/b
26. k= (a2-ab)/n
27. w=n/m
28. y= (b-as)/s
29. x= (b-pa)/p
30. z=e/(c+d)
31. m=t/(r+s)
32. n= (b-am)/a
33. y= (b2+aw)/w
34. u= (s-vt)/t
35. e= (n2-am2)/m2
36. x= (c-a²b)/ab

37.h=n-2r

38.(a)c= (t2-az-dz)/z  (b)z=t2/(a+c+d)

39.(a)m= (c+d)/(y+z)  (b)y= (c+d-mz)/m

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #3 2006-04-08 06:32:28

Math Student
Guest

### Re: Changing The subject of A formula

Thanks for helping!

Wow! I got most of them right and this was my first time too. I might be trying some harder ones soon so I might be posting again to check the answers! Thanks again for your help! ^_^