3. The points (15,21) and (25,35) form a proportional relationship.
a) Find the slope of the line through the points.
b) Which graph represents this relationship?

Answer:the letter is c because it the only one that is lined up and I got it right trust me

Step-by-step explanation:

The slope of the line passing through (15,21) and (25,35) is 7/5.

The slope of a line is a measure of its steepness.

Given that, the points (15,21) and (25,35) form a proportional relationship.

Slope = (y2-y1)/(x2-x1)

= (35-21)/(25-15) = 14/10 = 7/5

The equation of a line passing through these two points are;

y - y1 = [(y2−y1)/(x2−x1)](x - x1)

y - 21 = 7/4(x - 25)

y = 7x/4 - 14

Hence, the slope of the line = 7/5

For more references on slope, click;

https://brainly.com/question/3605446

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