Question

Use the linear combination method to solve the system of equations. –2.1x + 4y = 5.3 2.1x – 5.5y = –0.2 What is the solution to the system? ( -1.1 ⇒ -9, 3.4 ⇒ -3.4)

Answer 1

x=-9, y=-3.4

Explanation:

-2.1x+4y=5.3......(1)

2.1x-5.5y=-0.2......(2)

(1)+(2) we get:

-1.5y=5.1

y=-3.4.

Put it in (1) equation we will have:

-2.1x-13.6=5.3

-2.1x=18.9

x=-9.