book Maths Puzzle Numerical Ability

how do you solve this problem:
y=2x-8
x=y+4

this problem is making me go mad!!!!
HELP ME PLEASE!!!!!!!!!!

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book Other Question

I am trying to help a friend with her homework, but we have both hit a brick wall, can someone send us the process to solve the following equation?
2/5(10x+25)=-10-4(x+3)
Thank you so much for your help.
Patty & Sunshine a two digit number is 6 times the sum of its digits. the tens digit is 1 more than the units digit. find the number.