Create an account
Evaluate a variable expression
to evaluate a variable expression, substitute a number for each variable and evaluate the resulting numerical expression
a verbal model describes a problem using words as labels and using math symbols to relate the words
equivalent variable expressions
equivalent variable expressions have the same value for all values of the variable(s)
Terms of an expression
The parts of an expression that are added together are called terms 4y, -6. 3y
an equation is a mathematical sentence formed by placing an equal sign, = between two expressions x +3 = 7
Solution of an equation
a solution of an equation with a variable is a number that produces a true statement when it is substituted for the variable. x + 2 = 4
2+2 = 4
Inverse operations are two operations that undo each other, such as addition and subtraction
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together