Question

Solve the pair of linear equations : x = 3y + 20 and 3x + y +15= 0
OR​

Answer 1

Answer:  x = -5/2 and y = -15/2

Step-by-step explanation:

x - 3y = 20

3x + y = -15

3*(x - 3y) = 3*20

(3x - 9y = 60) - (3x + y = -15)

-10y = 60 + 15

y=  75 / -10 = -15/2

x = 3*-15/2 + 20

  = (-45 +40)/2 = -5/2