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topjm [15]
3 years ago
13

Find the solution to the system of equations -3x-9y=18 4x+3y=12

Mathematics
1 answer:
chubhunter [2.5K]3 years ago
6 0

Answer:

(6,-4)

Step-by-step explanation:

-3x-9y = 18 (equation 1)

4x+3y = 12 (equation 2)

multiply equation 2 by 3, and add it to equation 2

-3x-9y = 18

12x+9y = 36

-----------------

X's cancel out

9x = 54

Divide both sides by 9

x = 6

Plug in 6 for x in any of the original equations

(Plugging into Equation 2)

4(6)+3y = 12       Multiply 4(6)

24+3y = 12         Subtract 24 from both sides

3y = -12              Divide 3 on both sides

y = -4

Therefore the solution is (6,-4).

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(1/2)*6*8 = 24 cm^2.

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Choose the pair(s) of integers that can be substituted into the equation ax2 - 6x + c = 0 so that it has two real solutions.
Maksim231197 [3]

The options are not provided, but method is stated below

Answer:

Quadratic equation ax2 - 6x + c = 0

options would be given for a and c

  1. substitute a and c
  2. check for Discriminant
  3.  b^2 - 4ac \geq  0
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These conditions will fetch us the result required among the options.

Note : the \geq sign will give us the result for Two real unequal solutions and two real equal solutions.  If we only need Real unequal solutions we only use > sign instead of \geq

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3 years ago
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Write a polynomial to represent the value of d dimes and n nickels.
nadya68 [22]
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If you want the expression in cents instead of dollars, then it would be 10d+5n

--------------------------------------------------------------------------------

The value of just the dimes only is 0.10d dollars
The value of just the nickels only is 0.05n dollars
Combined the total value is 0.10d+0.05n dollars
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3 years ago
Jason paid $50 to be a member of the Anglin Mighty Gym. When he takes 2 points
polet [3.4K]

Answer:

It will never cost the same amount.

But, It would take 5 classes for Erik to pass Jason.  

Step-by-step explanation:

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