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Ligningssystemer med substitutionsmetoden: kartoffelchips

For at løse et ligningssystem ved hjælp af substitutionsmetoden...

1. Isoler en af variablene i en af ligningerne, fx omskriv 2x + y = 3 til y = 3 - 2x.
2. Du kan nu udtrykke den isolerede variabel ved hjælp af den anden. *Erstat* det udtryk i den anden ligning, f.eks. omskriv x + 2y = 5 til x + 2(3 - 2x) = 5.
3. Nu har du en ligning med én variabel! Løs den, og brug svaret til at finde den anden variabel.

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