exam Maths Puzzle Numerical Ability

how will i plot and solve 2x-3y+6=0

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exam Other Question

Could you please help me solve this equation for A, B, and C.

11x^2-x+8/(x+1)(X^2+4)=A/(x+1)+Bx+C/X^2+4
Roberto invested some money at 7% and then invested $5000 more than twe the amount at 9%. His total income for two investments was $3950. How much was invested at 9%?