Question

Choose the correct first step(s) to solve the system using elimination.
4x + 7y = 6 and 6x + y = 2

(Points : 1)
4x + y = 6 → 4x + y = 6
(6x + y = 2)(7)→ 42x +7y = 14

A) 4x + 7y = 6x + y
B) y = -6x + 20 → 4x + 7(-6x + 20) = 6
C) (4x + 7y) + (6x + y) = 8
D) (4x + 7y) - (6x + y) = 4

Answer 1

last option. .

Answer 2

elimination is substitution. .

Answer 3

answer is D)

Answer 4

4x + 7y = 6 EQ(1)
and 6x + y = 2
lets try solving this one
D) (4x + 7y) - (6x + y) = 4
(4x + 7y) - (6x + y) = 4
(4x + 7y) - 6x - y = 4
-2x+6y=4 .. multiplying this by 2 we get
-4x+12y=8 EQ(2) add this to EQ(1)
4x + 7y = 6
------------
19y=14
y=14/19 ans you can now subs this to get x