Read the equation as a balance
Explain what each side represents before rearranging anything. The equals sign says the two expressions have the same value.
See why equations balance
A linear equation lab lets you test the idea behind the symbols. Change one coefficient at a time, try a value and explain why an operation must affect both sides.
A workflow you can use
Test a candidate value
Substitute your guess and calculate both sides. A mismatch gives you evidence to adjust the guess, not a reason to rewrite the equation.
Undo the addition
Subtract the same b from both sides. Write that operation explicitly so the equality stays visible.
Undo multiplication and check
When a is nonzero, divide both sides by a. Substitute the result into the original equation to verify it, not merely into the last line of your work.
Put the idea into practice
A concrete example
For 3x + 4 = 19, trying x = 4 gives 16 on the left and 19 on the right. Subtracting 4 from both sides leaves 3x = 15; dividing by 3 gives x = 5, which checks in the original equation.
When to use the iPhone app
Chalkline's listing describes question-led tutoring from photographed problems and worked analogies. It states that full worked solutions in the app are available through a parent or teacher unlock.
Know the boundary
This browser lab is an independent educational companion, not the app's protected student workflow. It deliberately offers an optional explanation and does not authenticate a parent or enforce the app's solution restrictions.
Linear equation balance lab
Solving a linear equation means keeping both sides equal while isolating the unknown. Set up an equation, try a value of x and inspect each side. Reveal the worked explanation when you want to compare your reasoning with the algebra.
The lab uses equations of the form a×x + b = c. The graph and values respond to your inputs; no photograph is uploaded and no general homework-solving service is called.
Inputs are processed in this page. Nothing is submitted to the app or a business. Download a result to keep it; this page does not automatically save your work.
What to keep in mind
This browser lab is an independent educational companion, not the app's protected student workflow. It deliberately offers an optional explanation and does not authenticate a parent or enforce the app's solution restrictions.
Explore Chalkline
Linear equation balance lab
Solving a linear equation means keeping both sides equal while isolating the unknown. Set up an equation, try a value of x and inspect each side. Reveal the worked explanation when you want to compare your reasoning with the algebra.
Open this toolLearn why both sides must stay equal
A linear equation lab lets you test the idea behind the symbols. Change one coefficient at a time, try a value and explain why an operation must affect both sides.
Read this guideChalkline vs Photomath for learning math
Choose based on the learning interaction, then check whether you can solve a similar problem without the tool. An explanation is useful when it helps you learn a method rather than simply produce an answer.
Read the comparisonTake the next step
with Chalkline.
Chalkline's listing describes question-led tutoring from photographed problems and worked analogies. It states that full worked solutions in the app are available through a parent or teacher unlock.
View Chalkline on the App StoreThe current listing requires iOS 26.0 or later. Some features have additional device requirements. Check the listing and purchase screen for current availability and terms.