1st one is D, 2nd one is A.
hope this helps!
By definition, perpendicular line are two lines that intersect at right angles. In other words, the angle made by two lines should be 90°. Therefore, the use of distance formula does not help because it only tells you if the sides are equal. It does not tell you about the intercepted angle.
A technique that can help you to know if two straight lines are perpendicular is is you find their slopes. Let's say the slope of line 1 is m1 and the slope of line 2 is m2. If m1*m2 yields a product of -1, then the lines are perpendicular. This is because if m1 is the negative reciprocal of m2, the lines are perpendicular. But if m1=m2, the lines are parallel, meaning they don't intersect at all.
Therefore, the answer is: <span>Find the slopes and show that their product is -1.</span>
Answer:
-3a^2 + 11a
Step-by-step explanation:
= 4a + -3a^2 + 7a
combine like terms
= -3a^2 + 11a
Answer:
24 miles per gallon
Step-by-step explanation: