exam Maths Puzzle Numerical Ability

when solving for quadric equations how do you get x equal to zero. do you do GCF?

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exam Other Question

would these pair of equations be parallel, perpendicular, or neither?
4x-3y=36;3x+4y=20?? how about ax-by=c;-ax+by=d?? A bank contains 30 coins, consisting of nickles, dimes, and quarters. There are twice as many nickles as quarters and the remaining coins are dimes. If the total value of the coins is $3.35, what is the number of each type of coin in the bank?