Solve this system of equations 2x y 7 5xy 21 Solutiongive

Solve this system of equations: 2x - y = 7 5x+y = 21

Solution

given the system of equations

2x - y =7

5x + y =21

add these two equations

7x = 28

x=4

plug x= 4 in equation1 ( 2x - y= 7)

OPTION A

A -->ANSWER

2(4) - y =7

8 - y =7

-y = 7 -8

-y = -1

y =1

so x=4, y=1