exam Maths Puzzle Numerical Ability

is this a linear equation 4x-2y=-1 explain

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exam Other Question

Mike drove 135 miles in 2.5 hours. Sam drove 91 miles in 1.75 hours. Who drives
at the faster speed?
I am not totally sure about how to do this one either. Do I divide each one of the miles to one of the hours? How do you complete the square for (((2x^2+3x+4=0)))?