Question

Aflati valorile numarului natural x pentru care 5x +2 mai mic sau egal cu 7
Dau coroana

Answer 1

5x+2 <= 7

5x <= 7-2

5x <= 5

x <= 5:5

x <= 1

x € (- infinit, 1]

Answer 2

5x+2≤7

(5x+2)+(-2)≤7+(-2)

5x+2-2≤7-2

5x≤5

$\frac{5x}{5}$≤ $\frac{5}{5}$

x≤1

=>x € (-∞,1]