## equations

Simple patterns, variables, the order of operations, simplification, evaluation, linear equations and graphs, etc.
jdessler
Posts: 1
Joined: Sun Nov 25, 2012 7:25 am
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### equations

if you have an problem like the on below and it says to subtract -23 from each sided to get the answer. so far so good

Because an equation represents a scale, it can also be manipulated like one. The diagram below shows a simple equation and the steps to solving it.

Initial Equation / Problem x + 23 = 45

Subtract 23 from each side x + 23 - 23 = 45 - 23

Result / Answer x = 2

(But then you get a problem like the one below)

The diagram below shows a more complex equation. This equation has both a constant and a variable on each side. Again, to solve this you must keep both sides of the equation equal; perform the same operation on each side to get the variable "x" alone. The steps to solving the equation are shown below.

Initial Equation / Problem: x + 23 = 2x + 45

Subtract x from each side x - x + 23 = 2x - x + 45
Result 23 = x + 45

Subtract 45 from each side 23 - 45 = x + 45 - 45
Result -22 = x

my question is how do you know what number or letter that has to be subtracked, that is where I am confused.

can somebody help

nona.m.nona
Posts: 288
Joined: Sun Dec 14, 2008 11:07 pm
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### Re: equations

Initial Equation / Problem: x + 23 = 2x + 45

Subtract x from each side x - x + 23 = 2x - x + 45
Result 23 = x + 45

Subtract 45 from each side 23 - 45 = x + 45 - 45
Result -22 = x