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bazaltina [42]
3 years ago
9

What is the result of subtracting the second equation from the first?

Mathematics
1 answer:
saul85 [17]3 years ago
7 0

Answer:

11x-8y=-9

Step-by-step explanation:

we have

8x-4y = -4 ----> First equation

-3x+4y=5 ----> Second equation

we know that

To subtract the 2nd equation from the first, negate all three of the second equation terms:  3x-4y=-5

and then adds this result with the first equation

8x-4y = -4\\3x-4y=-5\\-------\\8x+3x-4y-4y=-4-5\\11x-8y=-9

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A music store marks up the instruments it sells by 30%
Nat2105 [25]

Answer:

A. $58.50, B. $80

Step-by-step explanation:

mark up percentage \frac{store price - actual price}{actual price} x 100

30 x 45 = 100SP - 4500

5850 = 100SP

Store Price > therefore, $ 58.50

A. $58.50

<em>Actual Price :</em>

130 AP = 10400 - 100AP

AP > $80

B. $80

3 0
3 years ago
Which value in this set is greatest in value? (31% , 0.311, 0.3) =
Gennadij [26K]

Answer:

0.311,31%,0.3

Step-by-step explanation:

0.311 is the greatest

31% is second greatest

0.3 is smallest

8 0
3 years ago
Find the missing dimension of the triangle.<br> DETAILED EXPLANATION.
sineoko [7]

Answer:

1.75 in

Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
The admission fee at an amusement park is $4.00 for children and $5.60 for adults. On a certain day, 284 people entered the park
miv72 [106K]
4c+5.6d=1360
Let
Children (c)=x
Adults (d)=284-x

4x+5.6 (284-x)=1360
Solve for x
4x+1590.4-5.6x=1360
4x-5.6x=1360-1590.4
-1.6x=-230.4
X=230.4÷1.6
X=144 children

284−144=140 adults
3 0
3 years ago
A lighthouse keeper has a 10 degrees angle of depression between the horizontal light beam and the line of sight from the ship.
Andrei [34K]
107.75m
This is a trigonometric ratio problem. the angle of depression (10) is opposite the height (19m) and the distance is adjacent to the distance (x). opposite ad adjacent sides to the angle is a tangent problem.
tan \theta = \frac{opp}{adj}
plus in values, we know.
tan (10) = \frac{19}{x}
switch tan(10) and x using the products property.
x = \frac{19}{tan (10)}
plug in to calulator to get answer
x=107.75

4 0
3 years ago
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