exam Maths Puzzle Numerical Ability

1.3a2-4b2,for a=-3/4,b=1/2
2. -7x-3y, for x=-6
3. 6x-9y-8x+4y, x=1/2, y=1/3

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exam Other Question

please help me solve this promblem
use the substitution method to solve the linear system
here is the promblem
x-5y=-10
y=-2x-9
please help what is -2 over 3a^2b plus 5 ab^2 simplified?