exam Maths Puzzle Numerical Ability

This question needs to be solved with the addition/elimination method.
0.4x-0.1y=0.3
-80x+20y=40

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exam Other Question

Please help me!! Subtraction of polynomials... subtract the 2nd set of polynomials from the 1st set of polynomials... 8(x^5+3x^4-15x^3-4x^2+x) and 12x^4+6x^2-x-3 Please! I need thi I need help using the intercpet to graph this equation

x+2y=4