1234567890lknn
14.12.2019 •
Mathematics
What is the solution to the system of equations x-y=-1 and x-3y = 13
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Ответ:
x-y+y=-1+y
x=-1+y
Now substitute into x-3y=13
-1+y-3y=13
-1+1-2y=13+1
-2y=14
y=-7
Therefore, x= -8
Ответ:
0.99926
Step-by-step explanation:
Let the original number be 100, to decrease it by 7.4%, let's convert 7.4% to a decimal point. 7.4% = 0.074
100-0.074 = 99.926
Therefore the decimal multiplier to decrease by 7.4% is multiplying the original number by 99.926/100 = 0.99926