Question

x + y = 6

x - y = 8

Solve the system of equations.

(1, -7)
(7, -1)
no solution

Answer 1

substitute, (7,-1)

Answer 2

add the two equations
2x=14
x=7
substitute x=7 in any of the two equations say 1st one and get the value of y
7+y=6
y=6-7
y=-1

Answer 3

@nitz, thanks that was much more elaborate. i think i actually learned something:P

Answer 4

u are welcome