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vannitling12p4w44f
05.12.2020 •
Mathematics
3x+y=8 I really don't understand this and I have tried to get the answer but always end up wrong. 3x-y=4
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Ответ:
The solution of the system of the equation is (2, 2)
Step-by-step explanation:
Let us solve the system of equations
∵ 3x + y = 8 ⇒ (1)
∵ 3x - y = 4 ⇒ (2)
→ Add equations (1) and (2) to eliminate y
∴ (3x + 3x) + (y + -y) = (8 + 4)
∴ 6x + 0 = 12
∴ 6x = 12
→ Divide both sides by 6 to find x
∵![\frac{6x}{6}=\frac{12}{6}](/tpl/images/0952/8898/69b24.png)
∴ x = 2
→ Substitute the value of x in equation (1) to find y
∵ 3(2) + y = 8
∴ 6 + y = 8
→ Subtract 6 from both sides
∵ 6 - 6 + y = 8 - 6
∴ y = 2
∴ The solution of the system of the equation is (2, 2)
Ответ:
7
Step-by-step explanation:
Interquartile range= Q3-Q1
Q3=12
Q1=5
12-5=7