No, she did not substitute the correct x and y values :)
30x-15y
Multiply both the numbers inside the parentheses by 5 and remove the parentheses and the 5
We must build the proportion
deliveries made : deliveries due = x : 100
in fact, we must express the fraction of work done as a fraction with denominator 100.
So, we have

Trey has completed 45% of his work so far.
Answer:
Slope of the line perpendicular to the given line = 
Step-by-step explanation:
If two are lines are perpendicular to each other,
the product of their slopes = - 1 .
That is ,

Slope of the given line :

Hence slope of the line perpendicular to it :

U can find the reciprocal of a number by flipping the number.
example : the reciprocal of 1/5 is 5/1....the reciprocal of 2/3 = 3/2.
the reciprocal of x = 2/7.....that means x = 7/2
5 / (7/2) = when dividing fractions, flip what u r dividing by, then multiply
5 * 2/7 =
10/7 or 1 3/7 <==