exam Maths Puzzle Numerical Ability

can i get help solving this please?

sqrt3x+6+3=0

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exam Other Question

How would I graph these equations: (a) y = x + 3 (b) y = -1/3x (c) y = 1/3x (d) y = 3x?? If possible could you please show me how to graph all 4, because the more you show me, the easier it is for me to catch on. Graphing is very difficult for me. solve each of the following systems by substitution:

8x-4y=16
y=2x-4