# Thread: make Unknown variable subject and find its value,

1. ## make Unknown variable subject and find its value,

Hi could some one help me out to find the value of T(and help me rearrange)

2. Originally Posted by wolfhound
Hi could some one help me out to find the value of T(and help me rearrange)

make t subject,a=-2 b=3

3at + 2(b-t)=4t + 5
3at + 2b -2t=4t +5
-4t-2t + 3at= -2b + 5
$\color{red}-6t + 3t=-2b+5/a$
{red}-3t/-3=-2b+5/a-3
t=6+5/-2-3
t=-11/5
$-4t-2t + 3at= -2b + 5$
$-6t + 3at= 5-2b$
$t(-6+3a)= 5-2b$
$t=\frac{5-2b}{-6+3a}=\frac{5-2b}{3a-6}=\frac{5-2(3)}{3(-2)-6}=\frac {1}{12}$

3. Originally Posted by ramiee2010
$-4t-2t + 3at= -2b + 5$
$-6t + 3at= 5-2b$
$t(-6+3a)= 5-2b$
$t=\frac{5-2b}{-6+3a}=\frac{5-2b}{3a-6}=\frac{5-2(3)}{3(-2)-6}=\frac {1}{12}$