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Contact [7]
2 years ago
8

Please help with these questions I don’t know how to do them at all

Mathematics
1 answer:
IrinaK [193]2 years ago
8 0

Answer:

See below

Step-by-step explanation:

<u>1. Solve for y</u>

  • x = 0
  • z = 5x + 3 ⇒ z = 5*0 + 3 = 3
  • 4y + 6z = 26 ⇒ 4y + 6*3 = 26 ⇒ 4y = 26 - 18 ⇒ 4y = 8 ⇒ y = 2
  • y = 2
  • Option B

<u>2. Solve for x</u>

  • -7x - y = 6 ⇒ y = -7x - 6
  • x - 3y = 18 ⇒ x - 3(-7x - 6) = 18 ⇒ x + 21x + 18 = 18 ⇒ 22x = 0⇒ x = 0
  • x = 0
  • Option C

<u>3. Solve for x</u>

  • y = -4
  • z = 3x - 12
  • 3x + 3y = -6 ⇒ 3x + 3(-4) = -6 ⇒ 3x = 12 - 6 ⇒ 3x = 6⇒ x = 2
  • x = 2
  • Option B

<u>4.....................</u>

  • 0 = 1
  • The equation is false so it means no solution

<u>5...................... </u>

  • 0 = 0
  • The equation is true so it means infinitely many solutions

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