Question

solve by substitution method 3x-y=3 9x-8y=9​

Answer 1

Step-by-step explanation:

$3x - y = 3 - - \times 3 \\ 9x - 8y = 9 - - \times 1 \\ 9x - 3y = 9 \\ 9x - 8y = 9 \\ \: \: - \: \: \: \: \: \: + \: \: \: \: \: - \\ 5y = 0 \\ y = \frac{0}{5} = 0 \\ 3x - 0 = 3 \\ 3x = 3 \\ x = \frac{3}{3} = 1 \\ hence \: \: x = 1 \\ y = 0$