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ch4aika [34]
2 years ago
13

Solve each system by elimination. -2x + 8y = -30 9x - 16y = 15

Mathematics
2 answers:
galina1969 [7]2 years ago
5 0

Answer: −0.147540984 or 1.911885246

tresset_1 [31]2 years ago
4 0

Answer:

(-9, -6)

Step-by-step explanation:

-2x+8y=-30

9x-16y=15

Start by multiplying the first equation by 2:

-4x+16y=-60

Now, add the two equations to eliminate y:

9x-4x=15-60

    5x=-45

Divide both sides by 5

x=-9

Plug -9 in for x to solve for y:

-2(-9)+8y=-30

18+8y=-30

Subtract 18 from both sides

8y=-48

Divide both sides by 8

y=-6

(x,y)=(-9,-6)

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I hope that helps!
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A group of 18 people ordered soup and sandwiches for lunch. Each person in the group had either one soup or one sandwich. The sa
Minchanka [31]
Lets do this:-

A. 7 Sandwiches

18 - 7 = 11

7 × $7.75 =  $54.25
7 sandwiches cost $54.25.

11 × $4.50 = $49.50
11 soups costs $49.50

49.50 + 54.25 = 103.75
A is not d answer cuz d total of d lunches came to $113.50. 

B. 8 sandwiches

18 - 8 = 10

8 × $7.75 =  $62
8 sandwiches cost $62.

10 × $4.50 = 45
8 soups costs $45

62 + 45 = 107

B is not d answer cuz d total of d lunches came to $113.50. 

C. 9 Sandwiches.

18 - 9 =  9

9 × $7.75 = 69.75
9 sandwiches cost $69.

9 × $4.50 = 40.50
9 soups costs $40.50

69 + 40.50 = 109.5

C is not d answer cuz d total of d lunches came to $113.50. 

D. 10 Sandwiches

18 - 10 = 8

10 × $7.75 = $77.75
10 sandwiches cost $77.75.

8 × $4.50 = $36
8 soups costs $36.

77.75 + 36 = <span>113.75

</span>D is not d answer cuz d total of d lunches came to $113.50. 

So, based on your answer choices there is no correct choice. <span />
7 0
3 years ago
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