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The y-intercept equals 0.
Slope and y-intercept of y equals 2.5x is: Slope is 2.5 and y-intercept is 0
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If x = -7, then x3 = -343 so that 2x3 = -686 y = 2 then 15 y = 30 So 2x3 + 15y = -686 + 30 = -656
Slope is zero y-intercept is -7 there is no x-intercept for this equation