# How do you find the slope of the line with the given information A) 2x+y=7 B) the line is perpendicular to y=10x + 7?

(A) This is quite easy: subtract $2 x$ from both sides:
$y = - 2 x + 7$ so the slope is $- 2$
(B) If two lines are perpendicular, multiplying their slopes will allways give a result of $- 1$. Let's call the slope we want to find $m$
The equation is allready in slope-intercept form with a slope of $10$.
So: $m \cdot 10 = - 1 \to m = - \frac{1}{10}$