exam Maths Puzzle Numerical Ability

okay.
i need help with this one..

its called system of linear equations

3x+2y=10.

i have no clue how to do it.

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exam Other Question

a 7.61cm X 7.68cm rectangular piece of glass has a thickness of 2.2mm and a mass of 35.303g. What is the density of the glass? (x^3+2x^2+x+12)/(x+3)