book Maths Puzzle Numerical Ability

x= 2y-1 and 2x+y=81

solve using substitution

x=?
y=?

show work please thank you!!

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book Other Question

x/3 - y/2 = - 10/3
I Need Help With This Elimination Method Problem Involving Fractions. Fractions Confuse me. Fractions are Not My friend!!!!!!!!!!!!!
please help me with this problem thank you

a^2-6ab+8b^2

thank you