exam Maths Puzzle Numerical Ability

need help could u explain each step thanks

2x-y=6
x=13-2y equations by substitution

thank you so much homework

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exam Other Question

IF lea is 6 years older than Sue and john is 5 yrs older than lea and the toatl ages are 41 then how old is Sue.

Got question from teas test preview website 2(1+c)-(2+c)=10