exam Maths Puzzle Numerical Ability

1.)a man invested part of P150,000 at 12 percent and the remainder at 8 percent. if his annual income from the two investments is P14,560,how much does he have invested at each rat

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Any help would be really appreciated please. Ta

This is the last of my problems for now, I am really stuck. I do not know how to get the x and the y onto the same side with the = at the end. Ta

I have solve for X and Y

y=9-3x
x=8-2y Sketch one cycle of the curve

y = 2 sin(-3x)

Give the period, amplitude and phase shift