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Jobisdone [24]
3 years ago
5

12) -7x + y=-19 -2x + 3y =-19 Solve by elimination

Mathematics
1 answer:
asambeis [7]3 years ago
5 0

X = 2

Y = -5

Step-by-step explanation:

We will multiply -7x + y=-19 by 3 so we can make the ys identical with the second equation. This way, its easier to eliminate them;

3(-7x + y=-19) =

-21x + 3y = -57

Then we can eliminate the ys by elimination. Be keen with the sign before each value;

-21x + 3y = -57

-

-2x + 3y =-19

=

-19x = - 38

X = -38 / -19

X = 2

We can substitute the value of x in one equation get the value of y;

-7(2) + y = -19

-14 + y = -19

Y = -19 +14

Y = -5

Learn More:

For more on solving equations by elimination check out;

brainly.com/question/11155931

#LearnWithBrainly

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STEP 1:
Total runners originally= 8
# of runners to receive trophies= 4

8-2 drop outs= 6 runners total now

STEP 2:
= # of trophies ÷ total runners now
= 4/6
simplify by 2
= (4÷2)/(6÷2)
= 2/3 runners

ANSWER: 2/3 of the remaining runners will win a trophy.

Hope this helps! :)


6 0
3 years ago
A mobile phone costs $320. It is reduced in a sale by 45%. Work out the sale price of the mobile phone.​
Agata [3.3K]

Answer:

$176

Step-by-step explanation:

Total: $320 Subtract 45%= 0.45 Decimal = 176

4 0
2 years ago
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2 years ago
Which of the following is equivalent to RootIndex 5 StartRoot 13 cubed EndRoot?
prisoha [69]

Answer:

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Step-by-step explanation:

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3 0
3 years ago
Read 2 more answers
3. The lacrosse team is raising money by selling cheesecakes. The players plan to sell an entire cheesecake for $24.00 each and
vodka [1.7K]

To reach a raise of $ 700, you can sell 20 entire cheesecakes and 63 slices, or 10 entire cheesecakes and 132 slices, or 15 entire cheesecakes and 98 slices.

To determine, if they want to raise at least $ 700, how many of each could they sell, listing three possible combinations of entire cheesecakes and slices of cheesecake the players could sell to reach their goal, the following calculation must be performed:

  • C + S = 700
  • 24 x 20 = 480
  • 700 - 480 = 220 / 3.5 = 62.85
  • 24 x 10 = 240
  • 700 - 240 = 460 / 3.5 = 131.42
  • 24 x 15 = 360
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Therefore, to reach a raise of $ 700, you can sell 20 entire cheesecakes and 63 slices, or 10 entire cheesecakes and 132 slices, or 15 entire cheesecakes and 98 slices.

Learn more about maths in brainly.com/question/25903420

4 0
2 years ago
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