SOLUTION: Give the slope-intercept form of the equation of the line that is perpendicular to 5x + 4y + 4 and contains (-1, 9).

Question 173085: Give the slope-intercept form of the equation of the line that is perpendicular to 5x + 4y + 4 and contains (-1, 9).
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Is the equation supposed to be . I'll assume that it is.

Start with the given equation.

Subtract from both sides.

Rearrange the terms.

Divide both sides by to isolate y.

Break up the fraction.

Reduce.

We can see that the equation has a slope and a y-intercept .

Now to find the slope of the perpendicular line, simply flip the slope to get . Now change the sign to get . So the perpendicular slope is .

Now let's use the point slope formula to find the equation of the perpendicular line by plugging in the slope and the coordinates of the given point

.

Start with the point slope formula

Plug in , , and

Rewrite as

Distribute

Multiply

Add 9 to both sides.

Combine like terms. note: If you need help with fractions, check out this solver.

So the equation of the line perpendicular to that goes through the point

is .

Here's a graph to visually verify our answer:
Graph of the original equation (red) and the perpendicular line (green) through the point

.

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