Determine whether the System of equations 3x+y=-5; 3y+15=-9x

So, let's do it by isolating

y

in the first equation.

3

x

−

2

y

=

10

−

2

y

=

10

−

3

x

y

=

−

5

+

3

x

2

Now you just have to substitute this value of

y

in the second equation.

5

x

+

3

(

−

5

+

3

x

2

)

=

15

5

x

−

15

+

9

x

2

=

15

1

x

2

=

30

x

=

30

⋅

2

=

60

x

=

60

If

x

=

60

and the value of

y

is given by

y

=

−

5

+

3

x

2

, then:

y

=

−

5

+

3

(

60

)

2

=

−

5

+

180

2

=

−

5

+

90

=

85

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant

step-by-step explanation:

the answer is 128