I NEED HELP FAST!!!!!!!!!!ALgebra?

Question

how do you do this problem

4a- (5a+3) = -1

and also

x+5=x+(9-x)

it would mean so much if you would help THANX

Answer 1

when u open paranthesis it becoms

4a-5a-3=-1

4a-5a=2(u add 3 to both sides of eq)

-a=2

a=-2(devide bothe sides by -1)

x+5=x+9-x

x+5=9(x cancells -x on this side)

x=9-5

x=4

best of luck

Answer 2

4a - 5a - 3 = -1

-a - 3 = -1

-a = 2

a = -2

--------------------------------------...

x + 5 = x + 9 - x

x + 5 = 9

x = 4

Answer 3

BEDMAS

Brackets, Exponents, Division, Multiplication, Addition and Subtraction.

So, we cannot do anything within the brackets in the first question. There are no exponents.

So you have to multiply the negative in front of the bracket...into the bracket leaving you with 4a - 5a - 3 = -1.

Set the equation to zero which means you have to bring all numbers to one side of the equation leaving the other side with nothing...or 0.

Now you have 4a - 5a -3 + 1 = 0 Collect all the like terms.

-a - 2 = 0

Now separate the letters from the numbers remembering that anytime a number crosses over an equal sign it changes sign.

-a = 2. You always want to try and make the variable (the alphabet letter) be positive so you must multiply both sides by -1.

The final answer would be a = -2.

You can check you answer by substituting -2 back into the original question.

Answer 4

First, remember the Order of Operations:  You can remember it by using PEMDAS (Parentheses, Exponents, Multiply, Divide, Add, Subtract).  Another mnemonic for that is "Please Excuse My Dear Aunt Sally"   :)

4a - (5a + 3 ) = -1

You cannot do anything inside the parentheses and there are no exponents, so go to the next step, multiply from left to right:

4a -1(5a + 3) = -1

4a -5a -3 = -1

4a -3 = -1

Get like terms on opposite sides of the equal sign.

4a -3 +3 = -1 +3  (remember that what you do to one side of an equation, you MUST do to the other to keep it equal)

4a = 2

Divide both sides by 2 to isolate the variable "a".

4a/2 = 2/2

a = 1

See?

Second problem should be done the same way...

x + 5 = x + (9 - x)

Do the parentheses first:

x + 5 = x +1(9 - x)

x + 5 = x + 9 - x

Collect like terms on each side first...

x + 5 = 9 + 2x

Then get like terms on opposite sides of the equal sign by adding or subtracting...

x + 5 - 5 - 2x = 9 - 5 + 2x - 2x

Look at that closely.  You are doing two steps at once.  Getting rid of the 5 on the left (+5 - 5) and getting rid of the x variable on the right (+2x - 2x).

So...

-x = 4

Make x a positive by multiplying both sides by a negative 1.

-x * -1 = 4 * -1

x = - 4

There you go.  Understand all that?

:)