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valentinak56 [21]
2 years ago
5

8

Mathematics
1 answer:
FrozenT [24]2 years ago
5 0

Answer:

8x + 4y = - 40

We can divide both sides by 4

2x + y = - 10

3x + y = - 8

If wa substract first one from the other one we have :

2 = x

So y = - 10 - 4 = - 14

OA is correct

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Focus on number two ok
melomori [17]
Its simple, convert 1 and 2/3 into a fraction which is 5/3 and use KCF which is Keep Change and Flip,

How this works is that you keep the first fraction, then change the division sign to a multiplication sign (Change = change the sign into its oppisite) then flip the other fraction from being 5/3 into 3/5. And then you multiply top times top and bottom times bottom. After that you simplify if you can, Hope this helped!
7 0
2 years ago
Read 2 more answers
A lighthouse is 90 feet above sea level. The angle of depression from the top of the lighthouse to the center of the rock is 35
Marysya12 [62]
Notice the picture below

so.... the angle of depression, is above in dashed lines.... however, the angle of depression, is identical to the angle of elevation from the water, since, both angles are "alternate interior" angles

now, using the 45-45-90 rule, then we know the swimmer is 90 feet from the lighthouse, then just use the tangent ratio to get "x"

4 0
3 years ago
2x + 19 and x + 23 are alternate exterior angles. What is the value of x? *
Mamont248 [21]

Answer:

4

Step-by-step explanation:

2x+19=x+23

We simplify the equation to the form, which is simple to understand

2x+19=x+23

We move all terms containing x to the left and all other terms to the right.

+2x-1x=+23-19

We simplify the left and right sides of the equation.

+1x=+4

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5 0
2 years ago
IVE BEEN STUCK ON THIS FOR ABOUT 3 HOURS
V125BC [204]
A. Is the attached image. The slope is 7.5x

b. 1 = 7.5x

x = 1.33333…

This is hours so we must multiply this by 60

x = 8 min

3 0
2 years ago
find the slope of the line through the given pair of points, if possible. Based on the slope, indicate whether the line through
Nat2105 [25]
Easy peasy
slope=(change in rise)/(change in run)
aka
slope between points (x1,y1) and (x2,y2) is
slope=(y2-y1)/(x2-x1) since y is rise/up and x is run/leftright

points

(-7,-9) and (-5,-8)
x1=-7
y1=-9
x2=-5
y2=-8
remember minusing a negative means addin a positive
slope=(-8-(-9))/(-5-(-7))=
(-8+9)/(-5+7)=1/2

slope=1/2

positive slopes go from bottom left to top right

since it is less than 1
it is more horizonal than vertical




4 0
2 years ago
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