Question

What is the solution of this linear system?{X+Y=13 1/2x+y=10

Answer 1

x       +y=13
1/2*x+y=10   |-1

x       +y=13
-1/2*x-y=- 10   } +

x-1/2*x=13-10
1/2*x=3
x=3*2
x=6

6+y=13
y=13-6
y=7
The solution is : (6,7)