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.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )