Solving linear equations with two variables

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id: 21214

We want to find the solution $x,y$ that solves the two following equations at the same time: $$2x+1y=6,$$ $$2x-1y=-2.$$ What are the two equivalent equations we get by multiplying the first equation by 1 and the second equation by 1?

  • $$2x+1y=6,$$ $$2x-1y=-2.$$
    $$4x+1y=6,$$ $$2x-1y=-2.$$
    $$2x-1y=6,$$ $$2x-1y=-2.$$
    $$4x-1y=6,$$ $$2x-1y=-2.$$