15. tell whether the lines for each pair of equations are parallel perpendicular or neither
y=-3x+7
-2x+6y=3
16. tell whether the lines for each pair of equations are parallel perpendicular or neither
y=-1/5x+6
-2x+10y= 5

Step-by-step explanation:

15. The given lines are

Y=-3x+7 & -2x+6y=3 or, 6y = 3 + 2x or, .

The slope of the first line is -3 and the slope of the second line is [Comparing with the standard form of equation of straight line y = mx + c, where m is the slope of the straight line].

Two straight lines will said to be perpendicular to each other, if the product of its slopes will be equal to -1.

Since, , the equations are perpendicular with respect to each other.

16. The lines are and -2x + 10y = 5 or, 10y = 5 + 2x or, .

As per the question number 15, it is clear that these equations are not perpendicular.

Here, the slope of the first one is and the slope of the second one is .

The values are same with different sign. Hence, these equations are not parallel too.

the best buy, is the 4- kilogram bag of lollipops for $18.40.

step-by-step explanation:

i found my answer by dividing the cost of each bag by their respective weights.

14.88 divided by 2 = 7.44

17.29 divided by 3 = 5.77

18.4 divided by 4 = 4.6

24.4 divided by 5 = 4.88

by this, i found that the 4 kilo bag is the best buy.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225