If the first equation is multiplied by 3 and then the equations are added, the result is

3x + y = 3
x - 3y = -2

10x = 11
10x = 7
8x = 7

Option B is correct.

The result is, 10x=7

Step-by-step explanation:

Given the system of equation:

             ......[1]

           .......[2]

As per the statement: If the first equation is multiplied by 3 and then the equations are added.

Multiply equation [1] by 3 on both sides, we get

Using distributive property:

              .....[3]

Now, add equation [3] and [2], to eliminate y we get;

Therefore, if the first equation is multiplied by 3 and then the equations are added, the result is, 10x = 7

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

answer: 1 and 3

step-by-step explanation: