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Taya2010 [7]
3 years ago
10

SUPER URGENT!!!!!!!! I NEED HELP!!!!!1 PLSSSS!!!!!Use the linear combination method to solve the system of equations. Explain ea

ch step of your solution. 3x-8y=7" " " " x+2y=-7
Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
6 0

Answer:

x=-3,y=-2

Step-by-step explanation:

Given 2 expressions

S1:3x-8y=7

S2:x+2y=-7

Write one equation in terms of any variable (x or y)

Here I am writing S1 in terms of y

3x-8y=7\\3x-7=8y\\y=\frac{3x-7}{8}

Substitute this value of y as the value of y in S2

⇒x+2y=-7\\x+(\frac{3x-7}{8} )\times2=-7\\8x+6x-14=-56\\14x=-42\\x=-3

Therefore x=-3

Substitute this value of x in any of the expressions S1 or S2

Here i am substituting in S2

⇒x+2y=-7\\-3+2y=-7\\2y=(-7+3)\\2y=-4\\y=-2

Therefore x=-3 and y=-2

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There are 200 student in middle school and three fifths of them are girls how many are boys?
nadezda [96]

Answer:

80

Step-by-step explanation:

3/5 of 200 = 120

200-120 = 80

7 0
3 years ago
Read 2 more answers
PLease help me ,really need help with explanation​
mylen [45]

a)

Check the picture below.

b)

volume wise, we know the smaller pyramid is 1/8 th of the whole pyramid, so the volume of the whole pyramid must be 8/8 th.

Now, if we take off 1/8 th of the volume of whole pyramid, what the whole pyramid is left with is 7/8 th of its total volume, and that 7/8 th is the truncated part, because the 1/8 we chopped off from it, is the volume of the tiny pyramid atop.

Now, what's the ratio of the tiny pyramid to the truncated bottom?

\stackrel{\textit{\Large Volumes}}{\cfrac{\textit{small pyramid}}{\textit{frustum}}\implies \cfrac{~~\frac{1}{8}whole ~~}{\frac{7}{8}whole}}\implies \cfrac{~~\frac{1}{8} ~~}{\frac{7}{8}}\implies \cfrac{1}{8}\cdot \cfrac{8}{7}\implies \cfrac{1}{7}

3 0
2 years ago
1. COST Mr. Rivera wants to purchase a riding lawn
antiseptic1488 [7]

Answer:

p(x) = 0.85x

t(x) = 1.065x

(t o p)(x) = 0.9x

$2700

Step-by-step explanation:

If the marked price is $x, then the function p(x) that gives the price of the riding lawn mower after 15% discount will be

p(x) = x(1 - \frac{15}{100}) = 0.85x

where x is the marked price.

Now, the function that gives the total cost with sales tax will be given by

t(x) = x(1 + \frac{6.5}{100}) = 1.065x

where x is the discounted price.

Therefore, the composite function that gives the total cost of the riding lawn mower on sale is given by

(t o p)(x) = 1.065(0.85x) = 0.9x ............ (1)

where x is the marked price.

If the marked price x = $3000, then Mr. Rivera has to pay for the riding lawn mower, from equation (1),

(t o p)(3000) = 0.9 × 3000 = 2700 dollars. (Answer)

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3 years ago
On a basketball team, the following players made most of the 56 points made during the last basketball game.
Ivanshal [37]

Answer:

7.75

Step-by-step explanation:

56-27-21-0.25=7.75

4 0
3 years ago
MERRY CHRISTMAS!!! pls help me with this and you will get the Christmas present you wanted!!plus brainlist lol
scoundrel [369]

Answer:

0.2

<em>Hope this helps!</em>

<em />

<em>xoxo,</em>

<em />

<em>cafeology</em>

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3 years ago
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