I didn’t understand your steps. Can you mention what methods/formulas you used and write how you approached the question to begin with?

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hello! ‘d=…’

is the she used

she took A B C (coefficients) out of the equation by writing it from y=mx+b to mx+y+c

then she used the formula to but the values in their places. then used the coordinate to multiply with the coefficients which is how Ax1= 2/3* 3

3 is the coordinate and 2/3 is the A coefficient

the rest is putting the values in and solving

this explanation seemed confusing but hope this helps

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