Cho biết ý nghĩa các giá trị trong bảng kết quả chuẩn độ điện thế sau đây? V tại điểm tương đương là bao nhiêu? V (ml) E (mV) ∆E/∆V
24.10 183 110
24.20 194
24.30 233 390
24.40 316 830
24.50 340 240
24.60 351 110
24.70 358 70

linda: 3 ; laura: 15

step-by-step explanation:

note that linda + laura's age is 18, and that linda is 12 years younger than her sister.

let "linda" = x , "laura" = y:

x + y = 18

x = y - 12

first, plug in y - 12 for x in the first equation:

(y - 12) + y = 18

simplify.

2y - 12 = 18

isolate the variable (y). note the equal sign, what you do to one side, you do to the other. do the opposite of pemdas. first add, then divide.

2y - 12 (+12) = 18 (+12)

2y = 18 + 12

2y = 30

(2y)/2 = (30)/2

y = 30/2

y = 15

next, plug in 15 for y in the second equation (the other equation would work too).

x = y - 12

x = (15) - 12

x = 3

linda's age is 3, laura's age is 15.

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