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morpeh [17]
3 years ago
14

how do i solve this. show all steps plz. this due very soon. help asap no idea what to do. ➡️MAKE SURE TO SHOW ALL STEPS!!!⬅️

Mathematics
1 answer:
Dmitry [639]3 years ago
5 0
Add the length and width of rectangle A and set equal to the sum of the length and width of rectangle B.
Then solve for d.
Once you know d, substitute it in each length and width to find the actual lengths and widths.

0.7d + 1 + 1.5d - 2 = 2.5 + d + 4 - 1.3d

2.2d - 1 = -0.3d + 6.5

2.5d = 7.5

d = 3

Rectangle A:
Length: 0.7d + 1 = 0.7(3) + 1 = 2.1 + 1 = 3.1
Width: 1.5d - 2 = 1.5(3) - 2 = 4.5 - 2 = 2.5

Rectangle B:
Length: 2.5 + d = 2.5 + 3 = 5.5
Width: 4 - 1.3d = 4 - 1.3(3) = 4 - 3.9 = 0.1
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A line contains the points (-3, 4) and (7, -1). Calculate the equation of the line in the form
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y=-\frac{1}{2}x+\frac{5}{2}

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m=\frac{y2-y1}{x2-x1}

So I will use (-3,4) as the first coordinate, and (7,-1) as the second coordinate.

x₁ = -3

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I will plug in these values to find the slope.

m=\frac{y2-y1}{x2-x1}\\\\m=\frac{-1-4}{7-(-3)}\\\\m=\frac{-5}{10}\\\\m=-\frac{1}{2}

Now that we know the slope is -1/2, we can plug in the slope and a point into the point slope equation.  Then we can solve for y.

y-y_{1} =m(x-x_{1} )\\\\y-4==-\frac{1}{2}(x-(-3))\\\\y-4=-\frac{1}{2}x-\frac{3}{2}\\\\ y=-\frac{1}{2}x+\frac{5}{2}

I have attached an image of what this graph should look like.  Since the slope is -1/2, the y value should decrease by 1/2 every time you move over by 1 on the x axis.  And since the equation says "+5/2" we know we have to shift the graph up by 5/2.  The y-intercept will be 5/2.

I added another image that shows how to graph an equation using the equation y=mx+b

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4 years ago
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Travka [436]

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