ANSWER
![y - x = - 1](https://tex.z-dn.net/?f=y%20-%20x%20%3D%20-%201)
EXPLANATION
The required equation passes through:
(4,3) and is perpendicular to x+y=4.
Rewrite the given equation in slope-intercept form:
![y = - x + 4](https://tex.z-dn.net/?f=y%20%3D%20-%20x%20%2B%204)
The slope of this line is -1.
The slope of the required line is perpendicular to this line, so we find the negative reciprocal of this slope.
![m= - \frac{1}{ - 1} = 1](https://tex.z-dn.net/?f=%20m%3D%20-%20%5Cfrac%7B1%7D%7B%20-%201%7D%20%3D%201)
The equation of the line can be found using:
![y - y_1 = m(x - x_1)](https://tex.z-dn.net/?f=y%20-%20y_1%20%3D%20m%28x%20-%20x_1%29)
We substitute the slope and point to obtain:
![y - 3 = 1(x - 4)](https://tex.z-dn.net/?f=y%20-%203%20%3D%201%28x%20-%204%29)
We simplify to get:
![y - 3 = x - 4](https://tex.z-dn.net/?f=y%20-%203%20%3D%20x%20-%204)
![y - x = - 4 + 3](https://tex.z-dn.net/?f=y%20-%20x%20%3D%20-%204%20%2B%203)
The required equation is
-4(x+10)-6=-3(x-2)
-4x-40-6=-3x+6
-4x-46=-3x+6
-4x-46+46=-3x+6+46
-4x=-3x+52
-4x+3x=-3x+3x+52
-x=52
(-x/-1)=(52/-1)
x=-52
Yes, it does. Because these points do respect the "law" that for each "x" there is only one "y" that corresponds to it
So the first one is 1 square meter of ceiling, and it says 1 square meter of cieling is 10.75. <em>So the first one is just that, 10.75</em>
The second one says 10 square meters, so just multiply 10.75, by 10.
In which case you get <em>107.5.</em> So that's the answer.
Third one, it gives you how many ceiling tiles you have. So you divide the 100 tiles by 10.75, which gives you 9.30232558, which becomes <em>9.3</em>
I'm sure you can figure out the last one.