exam Maths Puzzle Numerical Ability

Hello,
My 8th grader is stuck on problems involving systems of equations and inequality, or substition. Can you please explain the following problem?
How to find X and Y?
Y=x+3
Y=2x+4

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exam Other Question
Colin invested $32,000, part at 8% and part at 12%. If the total interest at the end of the year is $3,160, how much did he invest at each rate? Please help me with this.

Name the restriction on the domain:
X+5 3x-2
____ = ____
x-4 5x