book Maths Puzzle Numerical Ability

Please help me determine which two equations represent parallel lines
y = -4x + 4
y = 4x + 4
y = 1/4x + 4
y = -4x + 5


Thank you

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im lookin for some help with some problems that involve shapes and angles that i can not show on here cuz u can't show shapes or dram grids..im looking for a tutor i can email the i need to know the formula for finding a missing side of a right triangel(if two of the sides are already found) please answer as soon as poosibly thank you soo much!!