He can download at most 16 songs to leave $13 for himself to spend.
Use the equation $25-$0.75(x)=$13
First, we determine the slope of the line given, y = 2x + 5
The equation is in slope-intercept where in the slope of the line is the numerical coefficient of x. The slope is therefore 2.
The equation of the new line becomes,
y - 6 = 2(x - 4)
Simplifying, y = 2x - 2
What do you need help with ? :).
The algebraic expression for a phrase is: 
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Hope this help.
