Answer:
1716
Step-by-step explanation:
We can use nCr equation to find this
n=13
r=7
Answer:
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Step-by-step explanation:
First equation: x=-y+8
Second equation: on the picture
No it is not, the solution would need to be (2,-4) in order to satisfy the equation y = -2x -- like so -4 = -2(2)
-4 = -4, otherwise the equation won't be satisfied.