Before you solve anything, try this: move the slider and watch both sides of the equation.
Only one value balances it. That's what the question "solve for " is asking for: not a procedure, but the number that makes the statement true. So you can always check an answer without anyone's help.
Think about it first
If , what is ? Try it without finding .
is exactly double , so it's double 20. The answer is 40, and you never needed . Seeing structure like this saves time on every test.
Work through it
Is a solution of ?
Left side:
Right side:
Both sides match, so yes.
Watch out for this
Plugging a number into only one side and stopping there.
You're comparing two sides. Calculate both, or you haven't checked anything.
Your turn
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