exam Maths Puzzle Numerical Ability

PLEASE HELP ME FIND THE ANSWER TO: 7X+15Y=39 X-3Y=-20
THE CHAPTER IS CALLED SOLVING SYSTEMS USING ELIMINATION

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exam Other Question

Determine the y-intercept of the given function:
f(x)=-2(x-2)(x-1)^2(x+2)^3

a). (0,-32)
b). (-32,0)
c). (32,0)
d). (0,32)
6e^3x-6=18