Question

resolva as inequações, adotando u=z​

Answer 1

a) $5x - 4 < -7+1$

$5x < -6 + 4$

$5x < -2$

$x < -\dfrac{2}{5}$

b) $5 - 2x\leq 3x$

$5\leq 3x + 2x$

$5\leq 5x$

$x\geq \dfrac{5}{5}$

$x\geq 1$

c) $3x + 5\geq x - 5$

$3x - x\geq -5 - 5$

$2x\geq -10$

$x\geq -\dfrac{10}{2}$

$x\geq -5$

d) $7x - 4 > 9x + 12$

$7x - 9x > 12 + 4$

$-2x > 16$

$2x < -16$

$x < -\dfrac{16}{2}$

$x < -8$