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evablogger [386]

3 years ago

8

2x + y = 10

1 answer:

Elza [17]3 years ago

8 0

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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