exam Maths Puzzle Numerical Ability

If 3x+y=90 and 10<=x<=25 what is the least possible value of y?

And alss slove for d
d=3x/y*y+1/x

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exam Other Question

You own a business that sells silk-screened shirts. You want to know how many shirts you must sell to "break even". Your costs are 1500$ for the silk-screen equipment, plus 18$ in Find an equation for the family of lines that pass through the intersection of 5x-3y+11=0 and 2x-9y+7=0.

This is what I tried (2)5x-(2)3y+11=0
(3)2x-(3)9y+