Answer:
k = -6.
Step-by-step explanation:
We need to make the left side of the second equation a multiple of the left side of the first one.
We can do this by making k = -6 ( because -15/10 = -6/4).
The second equation becomes
-15x - 6y = 14
Now multiply this by -2/3. We get
10x + 4y = -28/3
but the first equation is 10x + 4y = -3 .
So there are no solutions.
So the answer is k = -6.
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