exam Maths Puzzle Numerical Ability

Can you please help me solve by graphing:(((2x+y=5 3x-y=10)))

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exam Other Question

graph:
(x-2)^2 = 2(y-1) 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