Y=3x-7 -4x+5y=20 solve algebraically

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asked Dec 2, 2023 53.6k views

1 vote

Y=3x-7
-4x+5y=20
solve algebraically

Mathematics
high-school

Vinoj Vetha asked

by Vinoj Vetha

3.2k points

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1 Answer

3 votes

Answer:

so x=5 and y= 8

Explanation:

$y = 3x - 7 \: \\ 20 = - 4x +5y \\ 20 = - 4x + 5(3x - 7) \\ 20 = - 4x + 15x - 35 \\ 20 + 35 = 11x \\ 55 = 11x \\ x = 5 \\ now \: you \: put \: x = 5 \: into \: the first \: equation \: \\ 5 \\ y = 3(5) - 7 \\ y = 8$

Shasak answered Dec 7, 2023

by Shasak

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