MATHEMATICS E3 algebra

1. Make y the subject of the formula in the equation x = y + 5

• y = – 5 – x

• y = x + 5

• y = x – 5

• – y = x – 5

Change the subject of the formula to w in the equation

f = w+7m.

• w = f+7m

• w = f - 7m

• -w = f + 7m

• w= -f + 7m

Change the subject of the formula to x in the equation p = 2x + r

• $x=\frac{p-r}{2}$

• $x\ =\ \frac{p+r}{2}$

• $2x\ =\ p-r$

• $2x\ =\ p+r$

Change the subject of the formula to t in the equation  $v=\frac{5t}{2}$  

•  $t=\frac{2v}{5}$  

• t=2v

Change the subject of the formula to d in the equation  $t\ =\frac{2d+3}{x}$  

•  $\frac{2d+3}{tx}$  

• 2d= tx +3

•  $d=\frac{tx-3}{2}$  

• -2d= tx +3

 Change the subject of the formula to r  in the equation  $A=tr^2$  

•  $tr=\sqrt{A}$ 

•  $r^2=\frac{A}{t}$  

•  $\frac{A}{r^2t}$  

•  $r=\sqrt{\frac{A}{t}}$  

Change the subject of the formula to a in the equation

v = u + at

• $a=\frac{v-u}{t}\$

• $a=\frac{v+u}{t}$

• $at=v-u$

• $at=\ v+u$

Change the subject of the formula to m in the equation P = mgh

• m=gh

• m=gh-P

• $m=\frac{P}{gh}$

 $g=\frac{t+a}{3t}$  Change the subject of the formula to t in the equation 

• t = a/3t

• a/3g

•  $t=\frac{a}{3g-t}$  

 $d=\sqrt{\frac{4A}{t}}$  Change the subject of the formula to A the equation

• A= $td^2$  

• A=  $\frac{td^2}{4}$  

•  $\frac{4A}{td^2}$