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mylen [45]
3 years ago
13

2x - y = 5 3x + 2y = 4

Mathematics
2 answers:
Serhud [2]3 years ago
5 0

Answer:

x = 2

y = -1

Step-by-step explanation:

Using Substitution: 2x - y = 5           3x + 2y = 4

2x - y = 5                                      

-y = -2x + 5

y=2x - 5

3x + 2 (2x - 5) = 4                        3x + 2y = 4

3x + (4x - 10) = 4                          3(2) + 2y = 4

7x - 10 = 4                                    6 + 2y = 4

7x = 14                                          2y = -2

x = 2                                             y = -1

Ksju [112]3 years ago
3 0

Answer:

x=2 and y=−1

Step-by-step explanation:

2x−y=5

2x−y+−2x=5+−2x

−y=−2x+5

−y

−1

=

−2x+5

−1

y=2x−5

substitute 2x−5 for y in 3x+2y=4

3x+2y=4

3x+2(2x−5)=4

7x−10=4

7x−10+10=4+10(Add 10 to both sides)

7x=14

7x

7

=

14

7

(Divide both sides by 7)

x=2

Substitute 2 for x in y=2x−5:

y=2x−5

y=(2)(2)−5

y=−1(Simplify both sides of the equation)

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Answer:

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Step-by-step explanation:

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WHAT IS THE ANSWER FOR 12 1/3 + 8 3/4 +17 2/8 +23 2/3=
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Simplify
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Change the denominators to be the same
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= 12  \dfrac{4}{12}  + 8  \dfrac{9}{12}  +17  \dfrac{3 }{12}  +23  \dfrac{8}{12}

Combine into single fraction
= 60  \dfrac{24}{12}

= 62

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