Always use the formula (y2-y1)/(x2-x1) to find a line’s slope, given two points:
(-1- -8)/(4-5) = 7/-1 = -7
-7 is the slope
Option C: 
Solution:
Given equation is 
.
This is a quadratic equation.
Here a = 1, b = 6, c = 7
To solve the given equation by quadratic formula,
Substitute the given values in the quadratic formula, we get
2 in the numerator and denominator are cancelled.
Option C is the correct answer.
Wouldn’t be 0 because that’s where the line cross the middle line
Answer by BlueSky06
The equation described above can also be written as, y = -x² + 100x + 4000To get the number of notebooks that will give them the maximum profit, we derive the equation and equate to zero. dy/dx = -2x + 100 = 0The value of x from the equation is 50. Then, we substitute 50 to the original equation to get the profit. y = -(50^2) + 100(50) + 4000 = 6500Thus, the maximum profit that the company makes is $6,500/day.
Read more on Brainly.com -
brainly.com/question/3586459#readmore
Answer:
x=7
Step-by-step explanation:
7x-7=4x+14
3x=21
x=7
