Question

i need help with both of them 3&4

Answer 1

3) $\frac{c}{a}$ = r - d   Multiply both sides by a

   c = a (r - d)   Divide both sides by (r - d)

   $\frac{c}{r - d}$ = a   Switch the sides to make it easier to read

   a = $\frac{c}{r - d}$

4) z = xm + y   Subtract y from both sides

   z - y = xm   Divide both sides by m

   $\frac{z - y}{m}$ = x   Switch the sides to make it easier to read

   x = $\frac{z - y}{m}$