[tex]The\ slope\ intercept\ form:\ y=mx+b\\\\18)\\5=-y-\dfrac{7}{3}x\ \ \ \ \ |+y\\\\5+y=-\dfrac{7}{3}x\ \ \ \ |-5\\\\\boxed{y=-\dfrac{7}{3}x-5}\\\\20)\\-25+5y=-x\ \ \ \ |+25\\\\5y=-x+25\ \ \ \ |:5\\\\\boxed{y=-\dfrac{1}{5}x+5}[/tex]
