Solve the system by substitution y=2x-7 -6x+7y=15

HELP PLEASE

x=8 y=9

Step-by-step explanation:

x

=

−

3

and

y

=

2

.

Solve

x

+

5

y

=

7

for

x

.

x

=

7

−

5

y

Substitute

7

−

5

y

for

x

into the other equation.

2

(

7

−

5

y

)

+

7

y

=

8

=

14

−

10

y

+

7

y

=

8

'

14

−

3

y

=

8

Subtract

14

from both sides.

−

3

y

=

−

6

Divide both sides by

−

3

.

y

=

2

Substitute

2

for

y

in the first equation.

x

+

5

(

2

)

=

7

=

x

+

10

=

7

Subtract

10

from both sides.

x

=

−

3

Check by substituting

−

3

for

x

and

2

for

y

into both equations.

2

x

+

7

y

=

8

=

2

(

−

3

)

+

7

(

2

)

=

8

=

−

6

+

14

=

8

=

8

=

8

Check.

x

+

5

y

=

7

=

−

3

+

5

(

2

)

=

7

=

−

3

+

10

=

7

=

7

=

7

Check.

Sorry if I'm wrong

three-fourths of an hour

36÷48=0.75

0.75=

8496 cars

step-by-step explanation: