Help me find the slope of these points

- and

Step-by-step explanation:

Calculate the slope m using the slope formula

m =

with (x₁, y₁ ) = S(12, 9) and (x₂, y₂ ) = T(21, 3)

= = = -

Repeat with

(x₁, y₁ ) = S'(4, 3) and (x₂, y₂ ) = T'(7, 1)

 = = -

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(x₁, y₁ ) = R(24, 18) and (x₂, y₂ ) = S(12, 9)

= = =

Repeat with

(x₁, y₁ ) = R'(8, 6) and (x₂, y₂ ) = S'(4, 3)

= = =

answer: x=60

14

step-by-step explanation:

14