# Write the standard form of equation of line Ax+By+C=0 passing through (1,2) and slope =7.?

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- llafferLv 74 weeks agoFavorite Answer
Starting from:

y = mx + b

And we have a slope (m) and a point (x and y) we can substitute what we know and solve for b:

2 = 7(1) + b

2 = 7 + b

-5 = b

So our slope-intercept form of the equation is:

y = 7x - 5

To put it into the form you want, move everything to the left side:

-7x + y + 5 = 0

You then want the leading coefficient to be positive so multiply both sides by -1:

7x - y - 5 = 0

- Φ² = Φ+1Lv 74 weeks ago
Ax+By+C=0 => 7x-y-5=0

-A/B = 7, so choose A = 7 and B = -1, giving C = 1*2 - 7*1 = -5.

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