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Sveta_85 [38]
2 years ago
11

What is an equation of the line that passes through the point (-7, -6) and is parallel to the line x-y=7?

Mathematics
1 answer:
Alex_Xolod [135]2 years ago
5 0

Answer:

Step-by-step explanation:

For two lines to be parallel their slopes must be equal. For two lines to be perpendicular their slopes must be the negative reciprocal of each other.

Step 1 Find the slope of the equation.

Put it into the slope-intercept form. y = mx + b.  

For x-y = 7, move the x to the left; therefore subtract the x from both sides. this leaves you  -y = -x + 7

Then, divide both sides by -1 to get a positive y.  -y/-1 = (-x + 7)/-1

This leaves y = x - 7  The slope(m) for this equation is m = 1

The other equation must also have a slope of 1 or m=1 for the lines to be parallel.

Use the point given to you (-7, -6) and substitute for (x, y)

The slope-intercept form y = mx + b can once again be used.

x = -7, y =-6, and slope or m = 1

Therefore,  y = mx + b substituted will be -6 = (1)(-7) + b; now, solve for b which is the y intercept

-6 = -7 + b add 7 to both sides -6 +7 = -7 + b +7 ; therefore, b = 1

Now you know the slope(m) which is equal to 1 and the y-intercept(b) which is equal to 1.

Finally, substitute the m and b in the slope-intercept form

            y = (1)x + 1 or y = x +1

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The ratio of men to women to children at a concert was 3:5:2. If there were 360 more adults than children, how many people were
Vladimir79 [104]
The question narrows the groups down from 3 groups with men, women and children to 2 groups with adults and children. Combine the ratios of the men and the women to children to create this new ratio: (3+5):2 = 8:2. You can then simplify it to 4:1.

Let x be the number of children.

4:1 = (x+360) : x

Cross-multiply the two ratios to get the expression below, simplify and solve for x:

x + 360 = 4x
360 = 4x - x
360 = 3x
x = \frac{360}{3}
x = 120

Since there are 120 children, simply add the number of adults (360 more than this value as mentioned before) and you have your final answer:

total = 120 + (360 + 120)
total = 600

Hope this helped :)
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Is the line y = 3x – 7 parallel or perpendicular to 3x + 9y = 9? Explain your answer.
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Answer:

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This means that they are perpendicular because the product of their slopes is -1.

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