What is the solution to this system of equations? x-2y=15
2x + 4y= -18
OA. x= 1, y=-6
OB. x= 1, y=-7
OC. x= 3, y= -6
OD. x= 3, y=-7

Step-by-step explanation:

X=2y+15

2(2y+15) + 4y= -18

4y +30 +4y = -18

8y +30 =-18

8y= -48

-6= y

X-(2(-6))=15

X- (-12)=15

X= 3

none of the option is correct.

step-by-step explanation:

it says to find which expression equals 9^3 sqrt 10 = ?

9^3 sqrt 10 = 729 sqrt 10.

checking option a. 5 sqrt 10 + 4 sqrt 10

5 sqrt 10 + 4 sqrt 10

= 9 sqrt 10.

checking option b. 5^3 sqrt 10 + 4^3 sqrt 10

5^3 sqrt 10 + 4^3 sqrt 10

= 125 sqrt 10 + 64 sqrt 10

= 189 sqrt 10.

checking option c. 5 sqrt 10 + 4^3 sqrt 10

5 sqrt 10 + 4^3 sqrt 10

= 5 sqrt 10 + 64 sqrt 10

= 69 sqrt 10.

checking option d. 5^3 sqrt 10 + 4 sqrt 10

5^3 sqrt 10 + 4 sqrt 10

= 125 sqrt 10 + 4 sqrt 10

= 129 sqrt 10.

hence, none of the option is correct.

answer: f true

step-by-step explanation: