huh. That's quite a question just to drop in. Have you not studied your algebra text?
The basic idea is that if an equation is true, it remains true if you apply identical operations on both sides of the equal sign.
The goal is to choose the operations in an order which will isolate the variable by itself on one side of the equation. Then you have solved the equation.
For example, if the equation is
3x+9 = 30
You want x all by itself. So, get rid of the +9 by doing "-9" on both sides:
3x+9-9 = 30-9
3x = 21
Now you have all the x stuff on one side, but you still don't have x b y itself. Since 3/3=1, divide both sides by 3:
3x/3 = 21/3
x = 7
Now you are done. If you substitute 7 in for x in the original equation, it will be true:
3(7)+9 = 30
21+9 = 30
30 = 30
How can you solve an equation or inequality in one variable?
1 answer
1 answer