exam Maths Puzzle Numerical Ability

Could someone please show me how i would grap this equation?
{{{y=x^2-5x+3}}}

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exam Other Question

5x+2y=13
x-4y=7



write the equation of the line whose slope is -3/7 and y-intercept is -4; write the answer in slope-intercept form.

I think it is done like this but am not sure.

y=(-3/7)x-4