Linear Equations in Two Variables on the Digital SAT: the Desmos Method
An equation with an x and a y in it is a line, and every question they ask about it is a single point on that line — so draw the line and click the point.
Algebra·65 practice problems in DesPrep
The Linear Equations in Two Variables lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 6 sections that take linear equations in two variables from first principles to the fastest Desmos route, with a worked example on every one:
- Every question here is a point
- If you cannot see the point, you have not zoomed out
- Standard form: one rearrangement, then you are done
- Paired values: read the line at the x they give you
- Two equations, one crossing
- When the line is hidden behind a slope and a point
Then 65 practice problems on this skill alone, solved inside a live Desmos calculator with step feedback and an expert replay on every one.
More Algebra guides
- Linear Equations in One VariableSolve a linear equation by graphing each side as its own function and reading the x-coordinate where they meet — no algebra, no sign errors.
- Linear FunctionsEvaluate and interpret linear functions on the graph — function values, slope and intercepts read straight off the curve.
- Systems of Linear EquationsGraph both equations and click where they cross — the fastest route to a solution, and it never makes an elimination error.
- Linear InequalitiesGraph the boundary line and let the picture tell you which values satisfy the inequality.