3 years ago

Solve the system of equations. -5x+2y=9. y=7x

Mathematics

1 answer:

il63 [147K]3 years ago

7 0

$- 5x + 2y = 9 \\ y = 7x \\ \\ - 5x + 2 \times 7x = 9 \\ - 5x + 14x = 9 \\ 9x = 9 \\ x = 1 \\ \\ y = 7 \times 1 = 7 \\$

Answer: (1; 7)

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