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Korvikt [17]
2 years ago
11

PLEASE HELP ME!!!

Mathematics
2 answers:
Anna007 [38]2 years ago
5 0

Answer:

1)(2x + y \:  \:  \: 2) = (1 \:  \: x - y) \\ so \: compare \: 2x + y = 1...(1) \\ 2 = x - y....(2) \\ 2x + y = 1...(1) \\ x - y = 2....(2) \\ (1) + (2) \\ 3x + 0y = 3 \\ x =  \frac{3}{3}  = 1 ....(3)\\  \\ put \: (3)in \: (1) \\ 2 \times 1 + y = 1 \\ y = 1 - 2 \\ y =  - 1 \\ here \: x = 1 \\ y =  - 1 \\ 2)(x  + 2y \:  \:  \: 3) \: and \: ( - 1 \:  \:  \: 2x - y) \\ here \: x + 2y =  - 1...(1) \\ 2x - y = 3...(2) \\ (2) \times 2 =  > 4x - 2y = 6...(3) \\ x + 2y =  - 1....(1) \\ (1) + (3) \\ 5x + 0y = 5 \\ x =  \frac{5}{5}  = 1....(3) \\ put \: (3) \: in \: (1) \\ 1 + 2y =  - 1 \\ 2y =  - 2 \\ y =  \frac{ - 2}{2}  =  - 1 \\ here \: x = 1 \\ and \:  \\ y =  - 1 \\ thank \: you

svp [43]2 years ago
4 0

Answer:

  • a) (1, -1)
  • b) (1, -1)

Step-by-step explanation:

a)

<u>Compare the coordinates:</u>

  • 2x + y = 1
  • x - y = 2

<u>Add up the equations to eliminate y:</u>

  • 2x + y + x - y = 1 + 2
  • 3x = 3
  • x = 1

<u>Find y:</u>

  • y = 1 - 2 = -1

b)

<u>Compare the coordinates:</u>

  • x + 2y = -1
  • 2x - y = 3

<u>Double the second equation and add to the first one:</u>

  • x + 2y + 4x - 2y = -1 + 6
  • 5x = 5
  • x = 1

<u>Find y:</u>

  • y = 2*1 - 3
  • y = -1
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