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Just like the quadratic formula. I have made a linear formula as i was thinking through how the quadratic formula (making x the subject of ax^2 + bx + c = 0) so i also made x the subject of the standard linear equation
y=mx+c
y-c=mx+c-c
y-c=mx
(y-c)/m=(mx)/m
(y-c)/m=x
PROOF
Solve;
1) 15=2x+3
x=(y-c)/m
x=(15-3)/2
x=12/2
x=6 CORRECT
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