book Maths Puzzle Numerical Ability

How do you solve these linear inequalities algebraically?

3x+4y=5
Ax+3y=B

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book Other Question

3(x+2)-2(x-4)=8-x Let a1, a2, a3,.......an,....be an arithmetic sequence. Find the indicated quatitties. Could someone please help me with this? a1=-11,d=4;a2=?,a3=?a4=?
Thank you!