Question

2x-7y=7;3x+y=22 solve this simultaneous equation>with explaination​

Answer 1

Step-by-step explanation:

$2x - 7y = 7 \\ x = \frac{7 + 7y}{2}$

$3( \frac{7 + 7y}{2} ) + y = 22 \\ \frac{21 + 21y}{2} + y = 22 \\ \frac{21 + 21y + 2y}{2} = 22 \\ 21 + 23y = 22 \times 2 \\ 21 + 23y = 44 \\ 23y = 44 - 21 \\ 23y = 23 \\ y = 1$

$\frac{7 + 7 \times 1}{2} \\ = \frac{14}{2} \\ = 7$

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