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Mariana [72]
3 years ago
5

Solve by using substitution . SHOW YOUR WORK. 3х + y = –17 бx — бу = –18

Mathematics
2 answers:
lilavasa [31]3 years ago
4 0

Step-by-step explanation:

1. 3x+y+17=0

2.x-y+3=0

Sorry mam I use mental math

weqwewe [10]3 years ago
4 0

Answer: X = —5 and Y = —2

Step-by-step explanation: What we have is a pair of simultaneous equations;

3X + Y = —17 —————-(1)

6X — 6Y = —18 ————(2)

We shall use the substitution method as instructed. Looking at equation (1),

We shall make Y the subject of the equation, hence

Y = —17 —3X

We shall now substitute for the value of Y into equation (2)

6X — 6Y = —18

6X — 6(—17 —3X) = —18

6X + 102 + 18X = —18

By collecting like terms we now have

24X = —18 —102

(Note that when a positive value crosses to the other side of the equation it becomes negative and vice versa)

24X = —120

Divide both sides of the equation by 24

X = —5

Having calculated the value of X as —5, we can now calculate Y as follows

From equation (1)

3X + Y = —17

3(—5) + Y = —17

—15 + Y = —17

Add 15 to both sides of the equation

—15 + 15 + Y = —17 + 15

Y = —2

Therefore, X = —5 and Y = —2

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Rational or irrational
Law Incorporation [45]

Hello, I am papaguy Your answer is ready!


Answer: A rational number is any number that can be expressed as a whole number, a fraction, or as a non repeating decimal. Otherwise, it is an irrational number. 

19/5: it is a rational number because it is in fraction form

√12: this is an irrational number

√49: this is a rational number because when you simplify this you will get the answer 7, that is a whole number.

0.3425563758:  This is a decimal, hence, this is rational.

4/25 :  it is a fraction so it is a rational number.

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Mark Brainliest if your happy with my answer.


~

Your Pal Papaguy



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X - 14 = y
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14^(7x) = 17^(-8-x)

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