Every line is a racer. Its slope is its speed, its y-intercept is its head start — and the intersection is the moment one racer catches the other. Build the race, read the graph, and let algebra call the photo finish.
Set each racer's speed (slope) and head start (y-intercept). The graph shows distance over time; the equations update live. Watch what happens to the meeting point when the speeds match — and when everything matches.
Five races, called before they run. Lock in your prediction first — then the reveal does the algebra and shows exactly where (or whether) the racers meet.
Three machines behind the racetrack: measure any line's slope with triangles, solve any one-variable equation (and classify its solutions), and crack any system.
Slope is rise over run — and thanks to similar triangles, ANY two points on a line give the same answer.
Combine, distribute, undo — and sometimes discover the equation has no solution, or is true for every x.
Two equations, two unknowns, one point that satisfies both. Substitute, solve, check — in the graph AND the algebra.
Ten questions from the starting gun to the photo finish. Wrong answers get a hint naming the exact machine or race that proves the right move.