book Maths Puzzle Numerical Ability

can you please help me with this equation..
what is the slope and y-intercept for the line:-10x-5y+20=0

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book Other Question
How do I establish the identity of the following? show steps please

1. sin theta(cot theta + tan theta) = sec theta

2. (sin theta + cos theta)^2 + (sin theta - cos theta)^2 = 2

Thanks 60/12=??...

18/t
t=3
18/3??..

5/8-p
p=3/16
5/8-3/16..?

1/2+ t
t=1/2
1/2+1/2=..?