Question: i need help with a systems of equations problem: 1)A mixture of 5 pounds of fertilizerA, 13 pounds of fertilizer B, and 4 pounds of

i need help with a systems of equations problem:

1)A mixture of 5 pounds of fertilizerA, 13 pounds of fertilizer B, and 4 pounds of fertilizer C provides the optimal nutrients for a plant. Commercial brand X contains equal parts of fertilizer B and fertilizer C. Commercial brand Y contains one part of fertilizer A and two parts of fertilizer B. Commercial brand Z contains two parts of fertilizer A, five parts of fertilizer B, and two parts of fertilizer C. How much of each fertilizer brand is needed to obtain the desired mixture?

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