Question

Solve the system of equations and choose the correct ordered pair.

7x + 8y = 4
3x + 2y = 6

A. (4, -2)
B. (2, 4)
C. (2, 3)
D. (4, -3)

Answer 1

Can you use matrices?

Answer 2

nope

Answer 3

Since no instructions were given on which method, I would choose the "elimination" method. Start by multiplying the second equation by a -4 getting:
-12x -8y =-24 now add the first equation.
7x +8y= 4
----------------
-5x =-20
x= 4 after dividing by -5.
3(-4) + 2y =6 substituting x value in 2nd equation.
-12 +2y = 6
2y =18
y=9

Answer 4

Did you follow with understanding?

Answer 5

ts wrong in a way thanks thou

Answer 6

To check for accuracy try in original equation:
7(-4) + 8(9) =4 I can see problem, something amiss here.
-28 +72=4
44=4 No way. Do you see where the error is located?

Answer 7

Ah so I found it, I substituted a -4 rather than a +4 it should be:
3(4)+2y=6
12 +2y = 6
2y=6-12=-6
y=-3
so the ordered pair is (4, -3)