Question

A) x-y=29

5x+y=73



B) x+y=33

2x-y=12

Answer 1

a) 17 - (-12) = 29
17 +12 = 29

5×17 + (-12) = 73
85 - 12 = 73


b) 15 + 18 = 33

2×15 - 18 = 12
30 - 18 = 12

Answer 2

A) x-y=29

 5x+y=73

 6x = 102

x = 102/6

x = 17

x - y = 29

17 - y = 29

   -y = 29 -17

   -y = 12 (-1)

   y = - 12

S = { 17, -12}

B) x+y=33

  2x-y=12

3 x = 45

   x = 45/3

   x = 15

 x + y = 33

15 + y = 33

   y = 33 - 15

   y = 18

S = { 15, 18}