exam Maths Puzzle Numerical Ability

Please Solve using the quadratic formula?? someone plesae help i dont even know what the quadratic formula is!!! 5x^2 - 3x - 3 = 0

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exam Other Question

What is the linear equation that created this table:
x=-3,-2,-1,0,1, 2, 3
y= 0, 2, 4,6,8,10,12
I am having trouble determining the formula/s to answer these problems.
Thank you
solve the following system of equations by the substitution method:

4x=3y+30
3y-5x=-33

after substituting, find the remaining equation and the y coordinate of the solution.