exam Maths Puzzle Numerical Ability

Ryan bought 8 pens and 7 pencils and paid a total of $14.70. Ashley purchased 4 pens and 6 pencils and paid $8.60. Find the cost for a single pen and a single pencil

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exam Other Question

PLEASE SOLVE THE FOLLOWING EQUATION WHERE X&Y ARE REAL :
Xi/1-yi=3x-yi/3x+4y
Good evening ma'am or sir, would you please help me on how to solve these 3 equations :

1). (ax^3)^2(ax^4)^3
2). (ab^2)^4(a^4b^2)^3
3). (5a^2xy^3)(b^3y^4)^3
Thank you very