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31-03-2022
Mathematics

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Solve using substitution. 7x + 9y = –7 y = 7

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31-03-2022

Answer:

[tex]x = - 10[/tex]

Step-by-step explanation:

[tex]7x + 9y = - 7[/tex]

[tex]7x + 9(7) = - 7[/tex]

[tex]7x + 63 = - 7[/tex]

[tex]7x + 63 - 63 = - 7 - 63[/tex]

[tex]7x = - 70[/tex]

[tex]7x \div 7 = - 70 \div 7[/tex]

[tex]x = - 10[/tex]

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