exam Maths Puzzle Numerical Ability

Can u explain how to do this problem. Step by step.

x over 4 - 9= 9;36

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exam Other Question

Which of the following exponential functions best describes the table below?
x: -0.1,0,0.1,0.2
y: 6,3,1.5,0.75
a) y=6(1/2)(^10x)
b) y=3(1/2)(^x/10)
c) y=3(1/2)(^10x)
d) y=3(2 Sometimes both equations will need to be multiplied to obtain opposite coefficients

EXAMPLE
3X + 5Y =6

-4X + 2Y =5