Question

mim ajuda por favor? ??

Answer 1

5x + 4y = 20

a) = (a,5)

5•a + 4•5 = 20
5a = 20 - 20
5a = 0
a = 0/5
a = 0
.
.
b) (-2, a)

5•(-2) + 4•a = 20
.
-10 + 4a = 20
4a = 20 + 10
4a = 30
a = 30/4
a = 15/2
.
.
c) (a, -8)
.
5a + 4•(-8) = 20
5a - 32 = 20
5a = 20 + 32
5a = 52
a = 52/5
.
.
.
resposta certa a = 0

a) (0 ; 5)