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A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.
3x+7y=68
3x-y=4
1. add to eliminate x
2. subtract to eliminate y
3. subtract to eliminate x
4. add to eliminate y
WILL GIVE 100 POINTS AND BRAINLIEST

Respuesta :

Answer:

  • Subtract to eliminate x

Step-by-step explanation:

We will need to eliminate the value of x to solve for y. If you want to solve for x first, do not eliminate it. Eliminate the 'y' variable. Once either variable is eliminated, it will be very easy to solve. Please check out my solution to learn more.

My solution:

  • => 3x + 7y = 68

             3x - y = 4

  • => 3x + 7y = 68

            -3x + y = -4

  • => 8y = 64
  • => y = 8
  • => 3x + 7y = 68
  • => 3x + 7(8) = 68
  • => 3x + 56 = 68
  • => 3x = 12
  • => x = 4

Hence, the correct step is "subtract to eliminate x".

Hoped this helped.

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