exam Maths Puzzle Numerical Ability

Find the y-intercept

7x +y =0

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exam Other Question

Divide. Use synthetic division if possible
(8x^4+5x^3+4x^2-x+7)/(x+1)
(12x^3+31x^2-17x-6)/(x+3)

i need some major help with these 2 questions. i was given 110 questions, i need some help with these 2=/ (4,-1)(-4,-3)