momoko

06-06-2009, 09:17 PM

Find the values of w and z if (2w + 4, z - 3w) is the solution of the simultaneous equations x/3 + 4y = 33 and 3x - y/3 = -30.

I have no idea how to solve this problem, but this is the work I've done so far anyway:

x/3 + 4y = 33 ----- (1)

3x - y/3 = 30 ----- (2)

Substitute (2w + 4, z - 3w) into (1) and (2),

(2w + 4)/3 + 4(z - 3w) = 33

(2w + 4)/3 + 4z - 12w) = 33 ----(3)

3(2w + 4) - (z - 3w)/3 = -30

6w + 12 - (z - 3w)/3 = -30

6w - (z - 3w)/3 = -42 ---- (4)

i don't really understand what to do now. any help would be really greatly appreciated :D

I have no idea how to solve this problem, but this is the work I've done so far anyway:

x/3 + 4y = 33 ----- (1)

3x - y/3 = 30 ----- (2)

Substitute (2w + 4, z - 3w) into (1) and (2),

(2w + 4)/3 + 4(z - 3w) = 33

(2w + 4)/3 + 4z - 12w) = 33 ----(3)

3(2w + 4) - (z - 3w)/3 = -30

6w + 12 - (z - 3w)/3 = -30

6w - (z - 3w)/3 = -42 ---- (4)

i don't really understand what to do now. any help would be really greatly appreciated :D