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Bas_tet [7]
3 years ago
10

Solve the following system of equations. Express your answer as an ordered pair in the format (a,

Mathematics
2 answers:
choli [55]3 years ago
8 0
The second equation is <span>-5-2y=2, then
</span>
<span>-2y=2-(-5),
</span>
-2y=2+5,
-2y=7,
y=7÷(-2),
y=-3.5.
The first equation is 2x+5y=16, subtitude y=-3.5 in this equation, then
2x+5·(-3.5)=16,
2x-17.5=16,
2x=16-(-17.5),
2x=16+17.5,
2x=33.5,
x=33.5÷2,
x=16.75.
Answer: (16.75,-3.5)


aleksandr82 [10.1K]3 years ago
3 0

Answer:

(x,y) = (-2,4)

Step-by-step explanation:

Consider the system of equation,

2x + 5y = 16  .......... (1)

-5x - 2y = 2   ......... (2)

Using Elimination method to solve the system of equation,

Multiply equation (1) by 5 , we get,

10x + 25y = 80  ...........(3)

Multiply equation (2) by 2 , we get,

-10x - 4y = 4   ......... (4)

Adding (3) and (4) , we get,

10x + 25y +( -10x - 4y )= 4 + 80

10x and -10x got cancel, we get,

25y  - 4y = 84

⇒ 21y = 84

⇒ y = 4

Put y = 4 in (1),

2x + 5(4) = 16 ⇒ 2x  = 16 - 20 ⇒ 2x  = -4 ⇒ x  = -2

Thus, (x,y) = (-2,4)


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maria [59]
Answer=24 blue marbles and 3 red marbles

r=red marbles
b=blue marbles
b=3(r+5)

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substitue b for '3(r+5)'
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valkas [14]

Answer:

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Assuming d = 14 is the diameter (which the problem really should state explicitly, not leave you to assume), then the radius is half of that.

So r = 7, where 'r' is the radius.

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Area = 49π is the exact answer, so it is the one I prefer.

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