Question

solve the following system of equation for the given variables
x + y = 7 ; x - y = -1​

Answer 1

Answer:

Step-by-step explanation:

x + y = 7  (name it as equation 1)

x - y = -1   (name it as equation 2)

x = 7 + y   (put the result of x in eq 2)

{(7+y) - y} = -1  (now multiply -y   with  (7+y))

-7y + y^2 = -1

y^2 = -1 -7y   (take under root)

y = -1 -7y     (put in eq 1 to find x)

x + (-1 -7y) = 7

x -1 - 7y = 7

x - 7y = 7+1

x - 7y = 8

x = 8 + 7y

(im bored)   .....its too long....!!!