exam Maths Puzzle Numerical Ability

How do you state the slope and the y-intercept form for this problem

2x+5y+10

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exam Other Question

I am a grade 10 students and i like trigonometry but i found this quiet tough.Plz can u solve it for me..
prove that (sec4a-1)/(sec8a-1)=tan4a/tan2a 1.Where do you use cramer's rule
2.Why would you want to use cramer's rule
3. The meaning of determinant