Let x/y be the original fraction.
After decreasing the numerator by 50% and decreasing the denominator by 25%, the fraction is:
(x - 0.5x) / (y - 0.25y) = (0.5x) / (0.75y)
= (2/3)(x/y) = 66 2/3% of x/y
So, the fraction decreased by 33 1/3%.
ANSWER
x+y=1
EXPLANATION
We want to find the equation of line CD which passes through (0, 1) and is parallel to x + y = 3.
In slope intercept form, the given line is
y=-x+3
The slope of this line is m=-1
Line CD also has the same slope
The equation is given by:
y=mx+b
The given point (0,1) means the y-intercept;is b=1
Hence the equation is
y=-x+1
In standard form the equation is:
x+y=1
-31 = -39 - y/8
-31 + 39 = - y/8
8 = - y/8
-8 = y/8
y = -8 x 8
y = -64