exam Maths Puzzle Numerical Ability

Determine which two equations represent parallel lines.(a) y = x + 3 (b) y = x - 6 (c) y = 2x + 10 (d) y = 2x - 3

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exam Other Question

This is from a worksheet.
Write the equation of the line that passes through point (1,-8) with a slope of 0.
A) x=-8
B) y=1
C) y=-8
D) x=1

If the slope is zero, I came up with x=-8. Is that correct? Factor completely.
t^6-20t^3+100