Question

Jika (x,y) penyelesaian persamaan 3x + 2y = 11 dan 2x - 3y = 3 maka nilai 3x + y =...

Answer 1

3x + 2y = 11 >>3x = 11 - 2y >> x = 11/3 - 2y/3
2(11/3 - 2y/3) - 3y = 3
22/3 - 4y/3 - 3y = 3
-4y/3 - 9y/3 = 9/3 - 22/3
-13y/3 = - 13/3
y = 1
maka 2x - 3(1) = 3
                 2x = 3 + 3
                   x = 6/2 = 3
jadi 3(3) + 1 = 10