Question

WILL FAN + MEDAL!

Solve the system by linear combination.

-x+4y= -1
2x-y= 5.5

Answer 1

-x+4y= -1 ...........(1
2x-y= 5.5 ..........(2
Multiplying eq (1 by 2 and then adding it with eq (2 we find
-2x+8y= -2 ...........(1
2x-y= 5.5 ..........(2
---------------------
7y = 3.5
y= 3.5/7
y= 0.5
Substituting y= 0.5 in eq (1 we find
-x+4 *0.5= -1
-x+2= -1
1+2= x
x=3
hence (x, y) = (3, 0.5)

Answer 2

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