Question

Se x=1 e y=-2 determine o valor de:
A) x+y
B) x-y
C) 2x
D) xy
e) x²
F) 5y+x

Answer 1

A,     1+2= 3

b,   1-2=  -1

c, 2.1=2

d, 1.2=2

e, 1²=1

f,  5.1+2= 7