Question

Considere 2x+5y
a)x=6, y=4
b)x=-7, y=6
c)x=-5, y=0
d)x=1, y=-2

Answer 1

a) 2x + 5y

2 (6) + 5 (4)

12 + 20

=22

b) 2x + 5y

2 (-7) + 5 (6)

-14 + 30

= 16

c)  2x + 5y

2 (-5) + 5 (0)

- 10 + 0

= - 10

d)  2x + 5y

2(1) + 5 (-2)

2 + (-10

2 - 10

= - 8