The answer to this question is D
Answer
Slope = 0
Explanation
For a straight line, the slope of the line can be obtained when the coordinates of two points on the line are known. If the coordinates are (x₁, y₁) and (x₂, y₂), the slope is given as

For this question,
(x₁, y₁) and (x₂, y₂) are (-3, -2) and (1, -2)
x₁ = -3
y₁ = -2
x₂ = 1
y₂ = -2
So,

Hope this Helps!!!
No it is not a linear equation because a linear equation has to be y=?x with nothing else on the end
From the second:
2x-y=4
x=(4+y)/2 and applying this to first:
4+y+3y=12
4y+4=12
4y=8
y=2 and since x=(4+y)/2, x=3 so
x+y=2+3=5