book Maths Puzzle Numerical Ability

I need to find the intercept point of y=3x+8 and 4x+2y=6. If you can find the answer, would you explain it to me? I also have a few more to do and I need to understand how to do it.

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book Other Question

simplify the following algebraic expression

Multiply: (2s +5z)^2(s + 3z)^2 At what point or why do we change the original inequality symble from < to > and vise versa
eg
(1) -2x < -8
-2x/2 > -8/-2
x > 4

(2) 3x/3 < 17/3
x < 17/3

Why did < change to > in eg (1) and not in eg (2)