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** left to right is top to bottom **

I am first asked to find 3 columns that span R3, I found that [-1,-1,0],[0,0,1],[1,0,-1] span r3 because they have a non-zero determinant. Now the next question is where i have trouble

I am asked to express the right side as a linear combination of the three columns i chose?

How can i write the three columns as a linear combination? I haven't been able to find any really good explanation of a linear combination, can ne one help?