Book Maths Puzzle Algebra

How do i identify the terms and the coefficients of the expression
y to the 2nd-10yz+2/3z to the 2nd?

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Book Other Question

How do i identify the variable and the constant expression for
t-5to the 2nd?
How do I solve a system of quations using substitution when the euations are

y=x+4

y=3x

The answer can either be no solution or infinitely many solutions, please explain your work