exam Maths Puzzle Numerical Ability

Write the equation of the line with given slope and y-intercept.

Slope: 5; y-intercept: (0, -2). Thanks for any assistance with this problem.

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i need help with this problem please...

write an equation in slope-intercept form that satisfies each condition.
passes through (2,-1) and is perpendicularto 3x-y=-3

i wrote it like 3(2)-(-1)=-3 5floz. of a 2% alcohol solution was mixed with 11floz. of a 66% alcohol solution. Find the concentrationof the new mixture.

I need to know how to set the problem up! thanks