book Maths Puzzle Numerical Ability

120 plus 5 angle what is the remaining angle?

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Can you pleae help me understand solving systems by substitution.
EX. -2x+4y=-8
-5x+4y=6 Solve each equation.

c/4= 16
1/2x= 48
-6d= -42
19= 3y - 5
6- 5c= -29
0.4s - 3= -1
4x - 9= 7x + 12
-4(2-3x) = 7 - 2(x-3)

these are giving me a headache!