book Maths Puzzle Numerical Ability

Can you pleae help me understand solving systems by substitution.
EX. -2x+4y=-8
-5x+4y=6

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book Other Question

I am a high school student who is having problems with equations and no matter how hard I try I cannot solve this equation.
can you please help me.
3x-4=2x+8
thank you 120 plus 5 angle what is the remaining angle?