exam Maths Puzzle Numerical Ability

please help to add

(x - 5 / x^2 - 5x - 14) - ( 2x / 7 - x)

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exam Other Question

derive the slope-intercept form of a linear equation from the slope formula using (o,b) as the coordinates of the point where the line crosses the y-axis and arbitrary point (x,y). Can someone help me on this problem?

I need to rewrite into standard form

(0, 5), m = - 3/5

Thanks,
sher