Question

7x - 3y = 31
7x + y = -1


Please solve x and y

Answer 1

(1, -8)

y= -8

x= 1

Explanation:

7x-3y= 31

7x+y= -1

solve the equation

7x-3y=31

7x= -1-y

substitute the value of 7x into an equation

-1-y-3y=31

subtract -y to -3y

-1-4y=31

add both sides by 1

-4y=32

divide both sides by -4

y= -8

substitute the value of y into an equation

7x= -1-(-8)

distribute

7x=7

divide both sides by 7

x=1

(1, -8)