-7x +y=-10 and -9x-y=-22

x = 2, y = 4

Step-by-step explanation:

- 7x +y = -10

-9x -y = -22

add up both equations

(-7x+-9x) + (y +-y) = (-10 +-22)

(-7x-9x) + (y -y) = (-10 -22)

-16x +0 = -32

-16x = -32

x = -32/ -16

x =2

substitute the value of x into the first equation

- 7x +y = -10

-7(2) + y = -10

-14 +y = -10

collect like terms

y = -10 +14

y = 14-10 = 4

x = 2, y = 4

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

answer: it is d

step-by-step explanation: