Mathematics for IGCSE & O level - Proportion (Section 3 - No. 15)
If *y* varies directly with *x*, what is the relationship between the graph of *y* against *x*?
A hyperbola
A straight line through the origin
A parabola
A horizontal line
คำอธิบาย
Direct proportion always results in a straight line that passes through the origin (0,0).