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Mademuasel [1]
3 years ago
8

3. Solve the system of equations using linear combination. a + c = 9 8a + 4.5c = 58

Mathematics
2 answers:
sergij07 [2.7K]3 years ago
7 0
A+c=9 so a=9-c
8(9-c)=72-8c+4.5c=58
12.5c=58-72
12.5c=-14
c=-1.12
lana66690 [7]3 years ago
5 0
Hey I have posted a picture the method I use to solve simultaneous equations is change the sign and follow the new sign.
This involves changing the sign for the second equation and solving it

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Help help help thanks
Dmitry [639]

Answer: a=2/5b + 1/5c (I may have answered your question but idk if I did)

Step 1: Add -4a to both sides.

9a−2b+−4a=4a+c+−4a

5a−2b=c

Step 2: Add 2b to both sides.

5a−2b+2b=c+2b

5a=2b+c

Step 3: Divide both sides by 5.

5a/5=2b+c/5

a=2/5b+1/5c

7 0
3 years ago
Olivia picked some peaches from her tree. She weighed each of the peaches. The results are shown in the line plot. What is the t
Strike441 [17]

Answer:

Hello,

the above question requires more information for anyone to be able to answer.

In the abscence of that, the total weight of the two heaviest peaches can be obtained by simply summing the individual weights of the two heaviest peaches.

If for instance there are 13 peaches and the two heaviest peaches weight 5Kg and 5.5 kg respectively, the weight of the two would translate to the following:

Step-by-step explanation:

5 +5.5= 10.5Kg

Cheers!

4 0
3 years ago
Evaluate 5p to the power of 3 when p = -2
Mrac [35]
5(-2)^3 5(-2) is -10 to the power of 3 is -1000
7 0
3 years ago
Read 2 more answers
HELP WILL MARK BRAINLIEST
kobusy [5.1K]

Answer:

(16)(1)                          => identity property of multiplication

2(3+7) = 2(3) + 2(7)    => distributive property

(2+6) + 3 = 2+ (6+3)   => associative property

9+0 = 9                      => identity property of addition

8 x 4 = 4 x 8              => commutative property

5 0
3 years ago
4n/5=84/15<br><br> i cannot figure out this math problem for my homework!
Vinil7 [7]
Okay so instead of dividing you will cross multiply.
4n(15)=84(5)
60n=420
420/60=7
Answer: n=7
4 0
3 years ago
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