exam Maths Puzzle Numerical Ability

I need help solving this exponential equation

5x2-3x=625

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exam Other Question

Can you please help me on this? Thanks I have no clue how to do it.

Find the missing coordinate to complete the ordered-pair solution to the given linear equation....

y=6x+5
(a) (0, )
(b) (3, ) I have no idea what this is called but a sample problem is ax+by=c and you have to solve for y.