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3 years ago

-2x-5y=3 3x-8=-6 solve by substition

Mathematics

2 answers:

ELEN [110]3 years ago

6 0

Maybe use photo math i guess

Irina18 [472]3 years ago

5 0

Answer:

x = 2/3

y = -13/15

Step-by-step explanation:

3x – 8 = -6

+8 +8

[addition property of equality]

3x = 2

÷3 ÷3

[division property of equality]

x = 2/3 → -2x – 5y = 3

[substitution property]

-2(2/3) – 5y = 3

[distributive property]

-4/3 – 5y = 3

[Create the proportional equivalent of each term so that all terms share the same denominator]

-4/3 – 15y/3 = 9/3

[multiplication property of equality]

3 ( -4/3 – 15y/3 ) = 3 ( 9/3 )

[distributive property]

-4 – 15y = 9

+4 +4

[addition property of equality]

-15y = 13

÷-15 ÷-15

[division property of equality]

y = -13/15

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You can stop there, or continue simplifying the solution by using properties of logarithms:

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