Which equation represents a proportional relationship? A)y = 5 B)x = 3 C)y = 2x + 3 D)y = 1/4 x
1 answer:
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Answer:
C
Step-by-step explanation:
The equation of a line passing through the origin is
y = mx ( m is the slope )
Calculate m using the slope formula
m = (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (0, 0) and (x₂, y₂ ) = (9, 3) ← 2 points on the line
m = =
=
, thus
y = x
Or
y = → C