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Vesnalui [34]
3 years ago
5

2х – у = 73х + y = 3​

Mathematics
2 answers:
Leokris [45]3 years ago
4 0

Answer:

x = 2

y = -3

Step-by-step explanation:

Solve by substitution:

2x - y = 7

Move the 2x to the other side: -y = 7 - 2x

Divide by -1: y = -7 + 2x

Take the other equation: 3x + y = 3

Substitute y in: 3x + (-7 + 2x) = 3

Take out the parenthesis: 3x - 7 + 2x = 3

Move -7 to the other side: 3x + 2x = 3 + 7

Simplify: 5x = 10

x = 2

Take the first equation: 2x - y = 7

Substitute x back in: 2(2) - y = 7

Simplify: 4 - y = 7

-y = 3

y = -3

mote1985 [20]3 years ago
3 0

Answer:

1. x = 1/2y + 3.5

2. x = 1 - 1/3y

Step-by-step explanation:

1. add y on both sides then divide 2 by both sides. It will equal x = 1/2y + 3.5

2. subtract y from both sides then divide both sides by 3. You will get x = 1 - 1/3y.

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The number A of tablet computers sold (in millions) can be modeled by the function A=4.5t2+43.5t+17 , where t represents the num
Rina8888 [55]
The problem indicates that A represents the number of tablet computers sold in millions. So, if 65 million were sold, we must substitute A = 65 to the equation. Then, we find for t.

65 = 4.5t² +43.5t + 17
Solving for t using a calculator,
t = 1 and -10.67

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That means the year would be 1 year after 2010. <em>Therefore, the answer is 2011.</em>
6 0
3 years ago
If f (x) = 5 x minus 25 and g (x) = one-fifth x + 5, which expression could be used to verify g(x) is the inverse of f(x)?
Vinil7 [7]

Answer:

The expression used to represent g(x) as inverse of f(x) is \frac{1}{5}(5x-25)+5

Option B is correct.

Step-by-step explanation:

We are given:

f(x)= 5x-25\\g(x)=\frac{1}{5}x+5

We need to find the expression that could be used to verify g(x) is the inverse of f(x).

We know that g(f(x))=x is inverse of function

So placing value of f(x) in g(x)

g(f(x))=\frac{1}{5}(5x-25)+5

So, the expression used to represent g(x) as inverse of f(x) is \frac{1}{5}(5x-25)+5

Option B is correct.

We can also solve to prove that g(f(x))=x

g(f(x))=\frac{1}{5}(5x-25)+5\\g(f(x))=\frac{5}{5}(x-5)+5\\g(f(x))=x-5+5\\g(f(x))=x

5 0
2 years ago
Read 2 more answers
Mark thinks the equation y=6x+4 will match the red solid graph. Mia thinks it will match the blue dotted graph. Who’s right? Exp
Rudiy27

Answer:

Technically neither, but Mia is correct.

Step-by-step explanation:

Slope-Intercept Form: y = mx + b

Since our slope <em>m</em> is equal to 6, it is a positive number. That means that the slope/line will be positive, so the line should be going up, not down. That means the blue line would be correct. Therefore, Mia is correct.

Technicality:

Since the blue line is dotted, the equation should be a <em>inequality </em>and not a linear equation. No solutions on the line would technically work. If the equation was y < 6x + 4 or something with an inequality sign, then it would be correct.

6 0
3 years ago
how for is Blaine's house if you must drive 6.5 hours through the woods at an average of 45mph to get there?
omeli [17]
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3 0
3 years ago
Rewrite the decimal in the sentence below as a percentage.
serious [3.7K]

Answer:

0.0066%

Step-by-step explanation:

6 0
2 years ago
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