Few ways you can do it,
1) Find the cartesian equation for the line (y=mx+c) and sub in the either the x or y value of C into it. C will lie on the line if the you get the other x/y value when you solve it
2) Calculate the gradient from A to C. C will lie on the line if the gradient is the same
1) Find the cartesian equation for the line (y=mx+c) and sub in the either the x or y value of C into it. C will lie on the line if the you get the other x/y value when you solve it
2) Calculate the gradient from A to C. C will lie on the line if the gradient is the same
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