Question

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exercício de sistema de inequações

Answer 1

Olá!
Isso trata-se de uma inequação

$x - 4 \leqslant 0 \\ x \leqslant 4 \\ - - - - \\ 2x + 4 > 6 \\ x > 6 - 4 \div 2 \\ x > 1$
$3x - 15 \leqslant 0 \\ x \leqslant \frac{15}{3 } \\ x \leqslant 5$

Answer 2

$x-4\leqslant 0\\\\\boxed{x \leqslant 4}\\\\\textsf{------------------}\\2x+4>6\\2x>6-4\\x>2\div2\\2x>2\\\\\boxed{x>1}\\\\\textsf{------------------}\\x+5>2\\x>2-5\\\\\boxed{x>-3}\\\\\textsf{------------------}\\3x-15 \leqslant 0\\3x \leqslant 15\\x \leqslant 15\div3\\\\\boxed{x \leqslant 5}$