Question

solve the system.3 x - 1 2 y = 1 1 4 x + 3 8 y = -1

Answer 1

Answer:

y = -13/14 and x = 240/7

Step-by-step explanation:

3x - 12y = 114 ............eqn 1

x + 38y = -1 ..........eqn 2

Multiply eqn 2 by 3

3x + 114 = -3

Subtract eqn 2 from 1

3x - 12y = 114

- 3x + 114 = -3

____________

0 - 126y = 117

y = 117/-126

y = -13/14

Sub y = -13/14 in eqn 1

3x - 12(-13/14) = 114

3x + 78/7 = 114

Multiply through by 7

21x + 78 = 798

21x = 798 - 78

21x = 720

x = 720/21

x = 240/7 = 34.29