Which ordered pair (a, b) is a solution to the given system of linear equations?
a (1, 7)
b (3, 1)
c (11, –23)
d (23, –11)

C. (11,-23)

Step-by-step explanation:

The given equations are

.....................equation 1

...................equation 2

Multiply first equation by 2

Now add this new equation to 2nd equation

Divide both sides by 2

We got a=11 , plug this value in anyone equation

3(11)+b=10

Subtract 33 from both sides

So solution is (a,b) = ( 11,-23)

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

10.416 m/s

step-by-step explantion:

distance=100m

time= 9.6s

average speed=100/9.6

=10.416 m/s