SOLUTION: The graph of the following system yields perpendicular lines. x + 2y = -10 -4y = 2x + 20 true or false?

Question 530426: The graph of the following system yields perpendicular lines.
x + 2y = -10
-4y = 2x + 20
true or false?
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
Get both equations into slope-intercept form and determine if their slopes are inverse reciprocals.
.
x +2y = -10
2y = -x -10
y = -1/2*x -5
.
-4y = 2x + 20
y = -2/4*x + 20/-4
y = -1/2*x - 5
.
The lines' slopes are equal, so the lines are parallel.
In fact, the lines lie one on top of the other such that they appear to be same line.
.
Answer: False. The lines are not perpendicular.
.
The graph is useful.
.

.
Done.
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