Question

Please Help!! Urgent ( Zoom in to see it better)

Answer 1

1. You are trying to isolate "F" in the equation

$C=\frac{5}{9}(F-32)$      Multiply 9/5 on both sides

$(\frac{9}{5})C=(\frac{9}{5}) \frac{5}{9} (F-32)$

$\frac{9}{5}C=F-32$    Add 32 on both sides

$\frac{9}{5}C+32=F-32+32$

$\frac{9}{5}C+32=F$

THIS IS WRONG

2. You are trying to isolate "y" in the equation

$m=\frac{x+y+z}{3}$   Multiply 3 on both sides

3m = x + y + z        Subtract x and z on both sides

3m - x - z = y

THIS IS CORRECT

3. Isolate "r"

$s=\frac{r}{r-1}$   Multiply (r - 1) on both sides

s(r - 1) = r    Distribute s into (r - 1)

sr - s = r     Subtract sr on both sides

-s = r - sr    Factor out r from (r - sr)

-s = r(1 - s)    Divide (1 - s) on both sides

$\frac{-s}{1-s}=r$

THIS IS WRONG

4. Isolate "b"

$A=\frac{1}{2}(a+b)$    Multiply 2 on both sides

2A = a + b     Subtract a on both sides

2A - a = b

THIS IS CORRECT

5. Isolate "y"

$m=\frac{x+y}{2}$    Multiply 2 on both sides

2m = x + y    Subtract x on both sides

2m - x = y

THIS IS WRONG

The 2nd and 4th one is right