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nekit [7.7K]
3 years ago
7

Algebra: Solving systems with Substitution and Elimination, EX: {y=2x 3x+y=5

Mathematics
2 answers:
Travka [436]3 years ago
6 0
I'll try my best to answer this question to the best of my abilities. 

3x+y=5
3x+(2x)=5
5x=5
x=1

Georgia [21]3 years ago
5 0
<u><em>subsitution</em></u> means subsituteing something for another and getting the answer
the way to do this is to get an easy equation and make it equal to only one placeholder so
y=2x
so you can subsitute y for 2x anywhere you see a y
3x+y=5
subsitutute
3x+2x=5
5x=5
divide both sides by 5
x=1
subsitute
y=2(1)
y=2





<u><em>elimination</em></u> is when you elimintate one of the terms by adding the equations together and canceling som of them out
so y=2x
subtract y from both sides
0=2x-y or 2x-y=0

add this to the second equation
3x+2x+y-y=0+5
5x=5
divide both sides by 5
x=1
subsitute
y=2(1)
y=2


x=1
y=2
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Can someone help me please asap
riadik2000 [5.3K]

Answer:

A. 55°

B. 71°

C. 100°

D. 65°

E. 120°

F. 155°

G. 147°

H. 36°

I. 70°

J. 54°

K. 24°

L. 40°

Step-by-step explanation:

A. 180 - (90 + 35) = 55°

B. 180 - (34 + 75) = 71°

C. 180 - (43 + 38) = 100°

D. 180 - 50 = 130 / 2 = 65°

E. 180 - (90 + 30) = 60°

180 - 60 = 120°

F. 180 - (120 + 35) = 25°

180 - 25 = 155°

G. 180 - 145 = 35 + 112 = 148°

H. 180 - (40 + 26) = 144°

180 - 144 = 36°

I. 180 - (60 + 65) = 125°

180 - 125 = 55°

180 - (55 + 50) = 75°

180 - (75 + 35) = 70°

J. 180 - 116 = 64°

180 - (64 + 62) = 54°

K. 180 - (138 +18) = 24°

L. 180 - (80 + 60) = 40°

7 0
3 years ago
Problem asked——Find a quick and easy method to compute the sum of the first 100 counting numbers. No calculators allowed.
Darya [45]

Answer

Step-by-step explanation:

split the numbers into two groups (1 to 50 and 51 to 100), he could add them together vertically to get a sum of 101.

1     + 2   + 3   + 4   + 5   + … + 48 + 49 + 50

100 + 99 + 98 + 97 + 96 + … + 53 + 52 + 51

1 + 100 = 101

2 + 99 = 101

3 + 98 = 101

.

.

.

48 + 53 = 101

49 + 52 = 101

50 + 51 = 101

Final total would be 50(101) = 5050.

50 addition problems all adding up to 101 thats how i got 50x101

4 0
4 years ago
Plot the value(s) on the number line where this function is equal to zero: f(x) = (x + 5)(x − 1).
Nadya [2.5K]

Answer:

2x^2

Step-by-step explanation:

Plot the value(s) on the number line where this function is equal to zero: f(x) = (x + 5)(x − 1).  you multiply by each side to get your answer

8 0
3 years ago
Write a comparison sentence that represents the equation.<br><br> 5 x 9=45
GuDViN [60]

Answer:

Step-by-step explanation:

5 x 9 = 45

9 x 5 = 45

45 ÷ 9 = 5

45 ÷ 5 = 9

6 0
3 years ago
What is the Fourth root of 32
geniusboy [140]
By calculator: it's 2.378

Since 2^5 = 32, so 32^(1/4) = 2^(5/4)
3 0
4 years ago
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