Write the sentence as an equation, Four times the difference of -10 and 3 amounts to -52.
1 answer:
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To solve this problem you must apply the proccedure shown below:
1. (x0,y0) is any point of the parabola.
2. You have that the distance between (x0,y0) and the the focus (-2,4) is:
√(x0-(-2))²+(y0-4))²
√((x0-+2)²+(y0-4))²
3. The distance between (x0,y0) and the directrix y=2, is:
|y0-2|
4. Then, you have:
√((x0-+2)²+(y0-4))²= |y0-2|
5. When you simplify it and you clear y0, you obtain:
y0=(x0²/4)+x0+4
6. Therefore, <span>the equation of the parabola with focus (-2, 4) and directrix y = 2, is:
</span>
y=(x²/4)+x+4
7. The graph is shown in the figure attached.
The answer is: y=(x²/4)+x+4
1. (x0,y0) is any point of the parabola.
2. You have that the distance between (x0,y0) and the the focus (-2,4) is:
√(x0-(-2))²+(y0-4))²
√((x0-+2)²+(y0-4))²
3. The distance between (x0,y0) and the directrix y=2, is:
|y0-2|
4. Then, you have:
√((x0-+2)²+(y0-4))²= |y0-2|
5. When you simplify it and you clear y0, you obtain:
y0=(x0²/4)+x0+4
6. Therefore, <span>the equation of the parabola with focus (-2, 4) and directrix y = 2, is:
</span>
y=(x²/4)+x+4
7. The graph is shown in the figure attached.
The answer is: y=(x²/4)+x+4
Given that,
The equation of line is y=7/5x+ 6 and that passes through the point (2,-6).
To find,
The equation of line that is perpendicular to the given line.
Solution,
The given line is :
y=7/5x+ 6
The slope of this line = 7/5
For two perpendicular lines, the product of slopes of two lines is :
Equation will be :
y=-5x/7+ b
Now finding the value of b. As it passes through (2,-6). The equation of line will be :
So, the required equation of line is :
y=-5x/7+ (-32/7)