Question

Help me please with math

Answer 1

Answer:

2) y = x - 4

   y = -x + 2

   => x - 4 = -x + 2

   => 2x = -6

   => x = -3

   => y = -3 - 4 = -7

3) y = 3x + 1

   y = 5x - 3

   => 3x + 1 = 5x - 3

   => 2x = 4

   => x = 2

   => y = 3(2) + 1 = 7

4) 2x + y = 8 => y = -2x + 8

   y = x - 7

   => -2x + 8 = x - 7

   => 3x = 15

   => x = 5

   => y = 5 - 7 = -2

Answer 2

Answer:

• given below ↓

Explanation:

2)

y = x - 4

y = -x + 2

as they are equal:

-x + 2 = x - 4

-x - x = -4 - 2

-2x = -6

x = 3

y = -x + 2

y = -3 + 2

y = -1

solutions: (3,-1)

3)

y = 3x + 1

y = 5x - 3

as y are equal:

5x - 3 = 3x + 1

5x - 3x = 1 + 3

2x = 4

x = 2

y = 3x + 1

y = 3(2) + 1

y = 6 + 1

y = 7

solutions: (2,7)

4)

2x + y = 8

y = x - 7

insert equation x - 7 in replace of y in equation 1

2x +  x - 7 = 8

3x - 7 = 8

3x = 15

x = 5

y = x - 7

y = 5 - 7

y = -2

solution's: (5,-2)