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Solve the system by substitution. {:[y=-4x+5],[-7x-y=-11]:}

Solve the system by substitution.\newliney=−4x+5−7x−y=−11 \begin{aligned} y & =-4 x+5 \\ -7 x-y & =-11 \end{aligned}

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Q. Solve the system by substitution.\newliney=−4x+5−7x−y=−11 \begin{aligned} y & =-4 x+5 \\ -7 x-y & =-11 \end{aligned}
  1. Identify total tape needed: Identify the total amount of electrical tape needed and the amount of tape on each roll.\newlineThe electrician needs 8,0008,000 centimeters of electrical tape, and each roll contains 2,0002,000 centimeters of tape.
  2. Determine rolls needed: Determine the number of rolls needed by dividing the total amount of tape by the amount of tape on each roll.\newlineTo find out how many rolls the electrician should order, we divide the total amount needed by the amount on each roll.\newlineCalculation: 8,000 cm÷2,000 cm/roll=4 rolls8,000 \, \text{cm} \div 2,000 \, \text{cm/roll} = 4 \, \text{rolls}

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