1 answer:
<em>3x - y = 5</em>
- Step-by-step explanation:
<em>2x + y = 10 | ×2</em>
<em>x - 2y = -5</em>
<em />
<em>4x + 2y = 20</em>
<em>x - 2y = -5</em>
<em>add</em>
<em>4x + x + 2y - 2y = 20 - 5</em>
<em>5x = 15</em>
<em>x = 15 : 5</em>
<em>x = 3</em>
<em>replace x</em>
<em>4(3) + 2y = 20</em>
<em>12 + 2y = 20</em>
<em>2y = 8</em>
<em>y = 8 : 2</em>
<em>y = 4</em>
3x - y =
= 3(3) - 4
= 9 - 4
= 5
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