Answer:

Step-by-step explanation:
We are given;
The equation 2x + 4y = 7
A point (2, -5/4)
We are supposed to determine the equation of a line perpendicular to the given line;
First, we determine the slope of the given line by writing the equation in the form of y= mx + c
2x + 4y = 7
y = -1/2x + 7/4
m₁ = -1/2
But, for perpendicular; m₁×m₂= -1
Therefore;
-1/2 × m₂ = -1
m₂ = 2
Thus, we can get the equation of the line;
Taking another point (x, y)





Thus, the equation of the line in question is 
Answer:
m = 2.25
b = 4.15
Step-by-step explanation:
Let us consider the points (1, 6.4) & (3, 10.9)
Slope (m) = (10.9 - 6.4)/(3 - 1) = 4.5/2 = 2.25
Now, by point slope formula of a line, we have:
Equating it with y = mx + b, we find:
m = 2.25
b = 4.15
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Answer:
The last one for the x column 12.8, and the last two for the y columns are 16 and 64.
Step-by-step explanation:
So you know that you have to multiply 0.8 by 4 to get 3.2, right? If you have to multiply 0.8 by 4, that means that you also have to multiply 4 by 4.
Sorry I'm not a great teacher :/
Hope this helps!
It’s going to take 29 days to lay all the tracks because 174/6=29