Solve the system of equations 4x+y=-10 and 9x+y=-15 by combining the equations.

4x+y=-10

9x+y=-15

make y the subject formula in equ 1

y=-10-4x

from equ 2

9x+-10-4x=-15

9x-4x=-15+4

5x=-11

x=-2.2

from equ 1

4(-2.2)+y=-15

y=-15+8.8

y=-6.2

perimeter = 10 +  √10  units

explanation:

first, we will need to get the length of each line using the distance formula which is as follows:

distance = 

1- length of ab:

ab =   = 5 units

2- length of ac

length of ac is the same as ab = 5 units

3- length of bc:

bc =   =  √10  units

now, we can get the perimeter by adding the side lengths as follows:

perimeter = 5 + 5 +  √10

perimeter = 10 +  √10  units

hope this : )

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