Question

a=2c
b+c=8
d=ab
a+b+c+d=8​

Answer 1

Answer:

a=18

b= -1

c=9

d= -18

Step-by-step explanation:

a+b+c+d=8

b+c=8

a+8+d=8

a+d=0

a=2c

d=ab=2cb

a+d=0(wrote that before)

2c+2cb=0

2c= --2cb

b= --1

b+c=8

c-1=8

c=9

a=2c=2(9)=18

d=ab=18(-1)= -18