exam Maths Puzzle Numerical Ability

1)5x+2y=-17
x=3y

2)4x-y=9
2x=3y=-27

3)1/2x+3/4y=-1/4
3/4x-1/4y=1

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exam Other Question

use a t-chart to graph y=1/x-5. Identify any asymptotes .State the domain and explanation of the following
a. f(x)=square root of (x+4)
b. g(x)=2x+1/x-7
c. h(x)= 3x^2+5x-3
d. l(x)=2x+3
e. m(x)=3/x^2+7