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Step-by-step explanation:

y -5x = 2

10x -3y =9

substitute x for 3/5 and y for -1

-1 -(5*3/5) = 2

(10*3/5) -3(-1) =9

simplify :

-1 -3 =2

6+3 =9

-4 =2 Not true

9=9 True

Conclusion: the point (3/5, -1) is not a solution to the given system of equations

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2