Y varies directly as x if y is 2 when x is 8 then the constant of variation is 1/4
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here x intercept is -1, so coordinate would be (-1,0)
we use two points (2,7.5) and (-1,0) to find the slope
slope=-7.5/-3 = 2.5
now let us use slope m =2.5 and point (-1,0) to get the y intercept
y=mx+b
0=2.5(-1)+b
b=2.5
plugging value of m and b in slope intercept form to get the equation
y=2.5x+2.5