Question

21x+3y=36 если x=4 y=2

5x-3y > 12 если x=5 y=2​

Answer 1

1)
$21x + 3y = 36$
$21 \times 4 + 3 \times 2 = 36$
$90 > 36$
2)
$5x - 3y > 12$
$5 \times 5 - 3 \times 2 > 12$
$25 - 6 > 12$
$19 > 12$