Question

Dado X=4 e y=-2, diga qual o valor numérico de cada expressão (algébrica):

a)5x-2y
b)-3x-3y
c)-2x-y
d)7x+2y
e)x-y
f)5x-2y​

Answer 1

Explicação passo-a-passo:

a)

5x-2y=5.(4)-2.(-2)

5x-2y= 20+4

5x-2y= 24

b)

-3x-3y=-3.(4)-3.(2)

-3x-3y=-12-6

-3x-3y=-18

c)

-2x-y=-2.(4)-(-2)

-2x-y=-8+2

-2x-y=-6

d)

7x+2y=7.(4)+2.(-2)

7x+2y=28-4

7x+2y=24

e)

x-y=4-(-2)

x-y=4+2

x-y=6

f)

5x-2y=5.(4)-2.(-2)

5x-2y=20+4

5x-2y=24