Question

3x + y = 19 and x + 3y = 1. Find the value of 2x + 2y

A) 20 B) 18 C) 11 D) 10

Answer 1

Answer:

D) 10

Step-by-step explanation:

Multiplying 1st equation by 3,

9x + 3y = 57

Now subtracting 2 from 1, we get,

8x = 56

x = 7

and now putting above value in 2,

7 + 3y = 1

3y = -6

y = -2

hence,

2x + 2y = 14 + (-4) = 10.