Answer:
b
Step-by-step explanation:
2x=y
×+y=36
x=Ed's age
y=His brothers age
Then you plug in Y into the secound equation.
×+2×=36.
You then add the two x together.
3x=36
The to get x by itself you take 36 and dive by 3 to get 12.
x=12
Then plug 12 into the equation
12+y=36
Then get y by itself.
y=24.
So, Ed's age is 12 and Ed's brother's age is 24.
Answer:
Diane sent 21messages
John sent 30 messages
Hans sent 84 messages
Step-by-step explanation:
Total messages =135
let messages sent by Diane =x
""". sent by John=x+9
sent by Hans=4x
Now the sum
x+x+9+4x=135
6x+9=135
6x=135-9
6x=126
x=126/6
x=21
Diane's message=x=21
John's message=x+9=21+9=30messages
Hans' messages=4×x=4×21=84
17.28 because 4.2 divided by 7 is .6 then .6 times 28.8 is 17.28