Question

find the value of x + y if 12 x+ 7y = 31 and 7 x + 12 y is 26​

Answer 1

Answer:

x=2, y=1

Step-by-step explanation:

12x + 7y = 31 )×7 → 84x + 49y = 217 ----(1)

7x + 12y = 26 )×12 → 84 x + 144y = 312----(2)

(2) - (1)

144y - 49y = 312 - 217

95y = 95

y = 1

(1) ===> 12x + 7(1) = 31

12x = 31-7

12x = 24

x =2