book Maths Puzzle Numerical Ability

Can you explain this in detail and help me with this please?

Find the equation of the line with a slope of -5 and passes through the point (2, -4).

Thank you

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book Other Question

how do you simplify raticals that have an equationon both sides like

X-3=THE SQUARE ROOT OF 30-2X

AND CAN YOU GIVE ME SOME OTHER EXAMPALES.

THANK YOU,
FROM,
MATH BREAKDOWN absolute value of {x +5} - 3=11