exam Maths Puzzle Numerical Ability

PLEASE HELP!!! I need help solving the following problems:

1. y=2x+7
y=5x+4

2. 3x-2y=0
x+y=-5

3. 4x+3y=-3
2x+y=-1

4. 2x-4y= 3.8
3x-y=17.7

solve all by using substitution!

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exam Other Question
When the digits of a two-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 11. What is the original number? Find the domain of the following

f(t)= log(t-5)