Question

write whether the following pair of linear equations is constant or not:x+y=14;x-y=4

Answer 1

As a whole they behave like a function of x and y having dependency and will fluctuate at any other values except (9,5).

Answer 2

x+y=14
x-y=4
_____
2x=18
x=9

x-y=4
9-y=4
y=5

The value of given linear equation is a constant when x=9 and y=5