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

What does the graph of y=1 look like? f of(x)=x(to the third)-5x(squared)-25x+125, find the zeros. For each zero you find, state whether the graph of f(s)crosses or only touches the x-axis.