What is the value of x in the solution to this system of linear equations?

X + y = 4

x-y = 6

a. 4

b. 6

с. - 1

d. 5

d:5

Step-by-step explanation:

isolate the y in second equation

x=y+6

substitute back into first equation

(y+6) + y=4

combine like terms

2y+6=4

subtract 6 from both sides

2y=-2

divide both sides by 2

y=-1

then plug y into either equation, ill use the first one

x + (-1) = 4 and then solve by subtracting - 1 and you get 5