Question

4) Calcule o valor numérico da expressão 5x - 4y, quando:
a) x = 5 e y = -5
b) x = 3 e y = -6
c) x = 20 e y = -8
d) x = -2 e y = -6
e) x = -1 e y = 3​

Answer 1

Resposta:

$a)5x - 4y =$

$5.5 - 4.( - 5) =$

$25 + 20 =45$

$b)5x - 4y =$

$5.3 - 4.( - 6) =$

$15 + 24 = 39$

$c)5x - 4y =$

$5.20 - 4.( - 8) =$

$100 + 32 = 132$

$d)5x - 4y =$

$5.( - 2) - 4.( - 6) =$

$- 10 + 24 = 14$

$e)5x - 4y =$

$5.( - 1) - 4.3$

$- 5 - 12 = - 17$