exam Maths Puzzle Numerical Ability

how do yew do this promblem
it is the linear system
please help me
here is the promblem
4x+y=12
y=-8

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exam Other Question

can you please help me: (((Graph the equation x-y=6))) Can you help?

Given the function: f(x) = -3(x + 2)2 (squared), find the vertex, axis of symmetry, and determine whether the f(x) has a minimum or maximum point.

Thank you.