Answer: y=-2x+5
Explanation:
The straight line equation is: y=mx+b
The slope m=-2
Hence,
y=-2x+b (1)
To determine the coefficient we take the point (1,3), that is x=1 y=3,
and substitute these values into formula (1):
3=-2(1)+b
3=-2+b
3+2=-2+b+2
5=b
Thus, b=5
The result is y=-2x+5