exam Maths Puzzle Numerical Ability

Use the Substitution method to solve the system of equations.

x + y = 10
y = x + 8

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exam Other Question

I need help please!!

Solve by adding like terms :

-3xy + 8xy^-1x^0 / y^-2 - 3x^2x^-1x / (x^-1)^-1

Thank u! evaluate the polynomial when x= -1, y=2, z=3

12^4y^2z+8x^3y-11x^7y+5x^5yz^2

solve
(5x^2y^5-13x^3y^3+8x^4y)-(-17y^5x^2+6x^3y^3+15yx^4-2xy^3)

(3/7x^4+3/4x^3-1/5x+3/8)+(1/