book Maths Puzzle Numerical Ability

I was trying to find out the answer to this problem.

Find the slope, x and y intercepts of:

y=3/4x

my answer is this

m= 3/4

y= 0

x= -3/4

is this right

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book Other Question

what is 13+32+a,given a=7 i really dont get properties what kind of properties are these?
10)7(8-3)=7(5)
13)(6+9x=15x
14)(7-4)(6)=3(6)
15)xyz=1xyz
16)8+5=(4+4)+5
17)if 6+3=9 and 9=3(3), then 6+3(3).