Solve the system of linear equations using elimination.
10x + 10y = −10
9x + 10y = −18
a) (8, 9)
b) (8, −9)
c) (−8, 9)
d) (−8, −9)

(x , y) = (8, -9)

Step-by-step explanation:

We have the equations as,

10x + 10y = -10 (1)

and

9x + 10y = -18 (2)

Now deducting (2) from (1) we get,

x = 8 (3)

Putting the value of x from (3) in (1) we get,

10y = -90

⇒y = -9 (4)

So, from (3) and (4) we get that,

(x , y) = (8, -9)  (Answer)

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: