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Mathematics, 07.05.2020 00:58 mdoswalt

Henrique began to solve a system of linear equations using the linear combination method. His work is shown below:
3(4x ā€“ 7y = 28) ā†’ 12x ā€“ 21y = 84
ā€“2(6x ā€“ 5y = 31) ā†’ ā€“12x + 10y = ā€“62
12x ā€“ 21y = 84
+ ā€“12x + 10y = ā€“62
ā€“11y = 22
y = ā€“2

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