Question

If x + y = 5 and 3x + y = 10. Find 3x - y?​

Answer 1

Step-by-step explanation:

x+y=5

3x+y=10

subtract equation 1 from2

3x-x+y-y=10-5

2x=5

x=5/2

put this value in eq 2

5/2+y=5

y=5-5/2

y=10-5/2

y=5/2

3x-y=3(5/2)-5/2

=15/2-5/2

=10/2

3x-y=5