#1 7.1 years old
#2 7.8 years old
#3 87.4
#4 74
#5 7.4
2:3 is equivalent to 0.666 repeating
If you have any further questions feel free to ask.
Hope this helps.
5x-9y=-65
10x-3y=20
Multiple the first equation by 2
10x-18y=-130
10x -3y=20
Then subtract the two equations to get rid of the x
21y=-150
Divide the -150 by 21
Y=-7.14
Plug the y into the original equation. (Either one)
5x-9(-7.14)=-65
5x-64.28=-65
Then add 64.28 to the -65
5x=-0.72
Divide by 5
X=-0.144
I hope this is right
