Use the form y=mx +b for linear equations. Write the equation for the following relation. C = {(x, y): (6, 15), (8, 21), (10, 27),}
I’m not sure if the answer is right, but here you go.
y=mx+b
’m’ is for gradient of the line. First, calculate the gradient.
Let’s use (6,15) and (8,21)
Gradient, m = \( y_{2} \)  \( y_{1} \)

\( x_{2} \)  \( x_{1} \)
= 21  15 = 6 = 3

8  6 2
Therefore, m = 3. Now let’s search ’b’.
Let’s use (6,15) again. Substitute it into the equation.
y=mx+b
15 = 3 (6) + b
b = 3
Thus, the equation : y=3x 3
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