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Firlakuza [10]
3 years ago
15

I'd really appreciate some help on these questions, I'm really struggling

Mathematics
1 answer:
nikklg [1K]3 years ago
6 0
We can use linear combinations of the equations to eliminate variables.

3x - 4y = 1
-2x + 3y = 1

To eliminate y we'll make the linear combination of 3 times the first equation minus four times the second. 

9x - 12y = 3
-8x + 12y = 4

Adding,
x = 7

We could solve for y directly but let's use another linear combination, twice the first plus three times the second:

2(3x - 4y) + 3(-2x + 3y)= 2(1)+3(1)

y = 5

Check: 3(7)-4(5)=1 good.   -2(7)+3(5)=1 good.

Q18 Answer: (7,5)

y = -3x + 5
5x - 4y = -3

4y +1(5x - 4y) = 4(-3x + 5) + 1(-3)

5x = -12x + 20 -3

17 x = 17

x = 1
y = -3(1) + 5 = 2
Check: 5(1) - 4(2) = -3 good

Q19 Answer (1,2)

6x + 5y = 25
x = 2y + 24
6x = 12y + 144
5y = 25 - 12y - 144
17y = -119
y = -119/17= -7
x = 2y+24= 10
Check: 6(10)+5(-7)=25 good   2y+24=2(-7)+24=10=x good

Q20 Answer (10,-7)


3x + y = 18
-7x + 3y = -10
9x  + 3y = 54
9x - -7x = 54 - -10
16x = 64
x=4
y = 18 -3x = 18-12=6

Check: 3(4)+6=18 good,  -7(4)+3(6)=-10 good

Q21 Answer: (4,6)

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Pls helpppp I give brainliest <3​
Pavel [41]

Answer:

9cups of dried split peas

8 qts of water

3 cups of chopped onion

4 cups chopped celery

8 lbs Ham shank

Step-by-step explanation:

The recipe serves 8 people, so to figure out how much you need to serve 32 people you multiply each measurment by 4 because 8 x 4=32.

2 1/4 x 4 = 9

2 x 4 = 8

3/4 x 4 = 3

1 x 4 = 4

2 x 4 = 8

6 0
3 years ago
(a + b)(a – b) = a2 + b2 true or false?
Alja [10]
False it's a2-b2 :))))
3 0
3 years ago
Read 2 more answers
What is the volume of the figure?
Brut [27]
Do you have a better picture?
8 0
2 years ago
please look at the problem and help. I tried to ask my teacher for help earlier but she ignored me so please don't ignore this.
Alchen [17]
36*40+36*40-6*6=2844ft^2

we had to subtract the area of the closet so it wasn't counted twice :P
8 0
3 years ago
Check all of the proper units of weight in the metric system.
MissTica
Gram and milligram are in the metric system and are for weight. Pound is the United States system and kiloliter measures liquids
4 0
3 years ago
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