exam Maths Puzzle Numerical Ability

Can someone please help me solve this equation?
Write equation of line that passes through point (4,-9) with slope of -4.

Thank you.

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exam Other Question

1. How many liters of a 50% solution should be added to a 80% solution to obtain a 60% solution? I'm trying to solve an equation that gives for graph examples. The problem is choosing the correct figure of the linear equation

y+2=3x+2

I subtracted 2 from both sides

y=