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larisa86 [58]
3 years ago
7

A city has 4 new houses for every 9 old houses. If there are 28 new houses in the city, how many old houses are there?

Mathematics
2 answers:
Ratling [72]3 years ago
5 0
The answer is B because 4 X 7 is 28 so 9 times 7 is 63
Ludmilka [50]3 years ago
5 0
The answer is 63, hope this helps
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Write an equation of a line perpendicular to the line 1/2x - 5 , passing through the point (-1 , 7)
jok3333 [9.3K]
<h3>Answer ↓</h3>

y=-2x+5

<h3>Calculations ↓</h3>

First of all we need to determine the slope of the line perpendicular to y = 1/2x - 5 .

The slopes of perpendicular lines are opposite reciprocals.

So we take 1/2 , turn it over , and change it's sign :

^1/_2\:\:\:--- > ^2/_1\:\:\:--- > 2\:\:\:--- > -2

The slope of the line perpendicular to y = 1/2x-5 is -2 .

Since we're also given a point that the line crosses , we can write the line's equation in point - slope form :

y-y₁=m(x-x₁)

y-7=-2(x-(-1)

y-7=-2(x+1)

Now convert to slope intercept :

y-7=-2x-2

add 7 on both sides :

<h3>y = -2x+5</h3>

\footnotesize\text{hope\:helpful}

7 0
2 years ago
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