Question

If 5x + y = 19 and x - 3y = 7, then x + y =
A)-4
B)-1
C) 3
D) 4​

Answer 1

Step-by-step explanation:

5x+y=19.......(1)

x-3y=7........(2)

by multiplying (2) by 5 and substracting,we get

5x+y =19

5x-15y=35

- + -

----------------------

16y=-16

y=-1

putting value of y in (1),we get

5x-1=19

5x=20

x=4

x+y = 4 + (-1)

= 3.

hope it helps....