100 points answer fast

which ordered pair is the solution to the system of equations?

{x + y =4
x − y= −6

a. (1, −7)

b. (−2, 4)

c. (2, 2)

d. (−1, 5)

The answer to this is ...

D. (-1, 5)

Hope this helped! <3

Ok to find out which is the answer you haev to plug in the points you have one by one in the x and y to see which point is the one that makes both equations true
E.J. 1-7=4 we automatically know that the first one is not true because 1-7 is not 4 so lest go with letter b
-2+4=4 we can cancel out letter b to because -2+4 does not equal 4 so lets check letter c
2+2=4 now we can see that this one is correct but before we call wins lets check if the second equation is also true 2-2=-6 this doesnt equal -6 so answer c can't be correct because even tho the first equation was true the second was not so it doesn't qualify... lets try our last option -1+5=4 this does equal 4 lets check the second equation to see it its true -1-5=-6 this is also true... this means that your answer would be letter D 

Hope this helped