The answer is negative three ( -3 )
Https://www.khanacademy.org/math/in-sixth-grade-math/ratio-and-proportion/unitary-method/v/finding-unit-rates
5 packs of stamps and 7 packs of envelopes. There will be a total of 70 envelopes and stamps.
Answer:

Step-by-step explanation:
Given expression:
2x + 5y = -10
The equation of a straight line is;
y = mx + c
y and x are the coordinates
m is the slope
c is the intercept
Now;
let us write the given expression in slope intercept format;
2x + 5y = -10
5y = -2x - 10
y =
- 2
So, the slope of the line is 
Answer:
78
Step-by-step explanation:
13 jars/pizza
6 pizzas
13x6=78