3(4x - 7y = 28)
-2(6x - 5y = 31)
12x - 21y = 84
<u>-12x + 10y = -62
</u> 0 - 11 y = 22
<u>
</u>y = 22/-11
y = -2
12x - 21y = 84
12x - 21(-2) = 84
12x + 42 = 84
12x = 84 - 42
12x = 42
x = 42/12
x = 3.5
Answer:
Step-by-step explanation:
Simplify
Answer:
4
Step-by-step explanation:
use the distace formula:
square root of (x2-x1)^2 + (y2-y1)^2
give brainliest please
Answer:
18
Step-by-step explanation:
In the linear regression equation y=a+bx, slope coefficient b represents average unit increases in y variable due to unit increase in x variable.
In the given equation ŷ = 84 + 18x, b=18 represents average unit increases in gas used due to unit increase in degree day.
Hence,on average, gas used increase by 18 for each additional degree-day.