Question

HELP !!!!!!!!!!!

Solve for the indicated variable.

P = 2L + 2W; for L



Solve for the indicated variable.

A = 1 + prt; for r

Answer 1

P = 2L + 2W
So you want to express L in terms of P and W correct? We need to start moving everything but L on to the other side of the equation.
2L + 2W= P what happens when we subtract both sides of the equation by 2W?

Answer 2

there is just 2L=P2W left..... Right????

Answer 3

Not exactly
2L + 2W= P
2L + 2W-2W= P-2W substract both sides by -2W
2L=P-2W

Answer 4

You substracted 2W from the left side, but multiplied it on the right

Answer 5

You always have to do exactly the same thing to both sides of the equation or it messes it all up.

Answer 6

Now we need to get rid of that 2 on the left side to have just L, what should we do?

Answer 7

dived 2 on both sides????

Answer 8

Great! What does that give us then?

Answer 9

nice explaining plainntall :)

Answer 10

L=P-2W/2

Answer 11

Almost, be careful
2L=P-2W
2L/2=(P-2W)/2 divide both sides by 2
L=(P-2W)/2 or P/2-W

Answer 12

You have to make sure people know you are dividing P-2W by 2 not just the 2W, that's why I use the parenthesis.

Answer 13

Now we have to get only r on one side of the equation
1 + prt = A

Answer 14

should i add 1 to both sides????

Answer 15

That would give us
1+1+prt = A + 1, we should probably subtract 1 from both sides so the 1 cancels on the left side of the equation

Answer 16

prt=A+1

Answer 17

Close, but remember you have to do the same thing on both sides of the equation. You subtracted 1 from the left side, but added 1 to the right.
1-1+prt=A-1
prt=A-1

Answer 18

What's next to get only r on the left side?

Answer 19

divide p and t on both sides???

Answer 20

Tremendous, you got it. Just be careful to use parenthsis.

Answer 21

ok it would be (A-1)/(pt)

Answer 22

Terrific, you got that
r=(A-1)/(pt) :D

Answer 23

thankx for the help

Answer 24

before u go could u help me with one more problem???