exam Maths Puzzle Numerical Ability

THE QUESTION: GRAPH EACH LINEAR EQUATION USING THE SLOPE AND Y- INTERCEPT.
8X-3Y=9. PLEASE HELP ME. SO CONFUSED????

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exam Other Question

The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3 + i among its roots. Express f(x) as a product of linear and quadratic polynomials w I am having trouble with a square root question. The question is: The square root of 108 plus square root of 54 minus the cube root of 729.