Answer:
X= 1/2 Y= 5
Step-by-step explanation:
8x+7y=39-------------(1)--------×2
4x-14y= -68-----------(2)-------×1
16X + 14Y = 78--------(3)
4X- 14Y = -68----------(4)
Addy equation (4) and (3)
20X = 10
dividing bothsides by 20
20X/20= 10/20
X = 1/2
substitute the value of X into equation (1)
8X+7Y = 39
8(1/2)+7Y= 39
4+7Y = 39
7Y = 39-4
7Y = 35
dividing bothsides 7
7Y= 35/7
Y = 5
Answer:
x=2
Step-by-step explanation:
First, subtract four on both sides and then divide both sides by 2 to get x=2.
2x+4=8
<em>-4 -4</em>
2x=4
<em>÷ 2 ÷2 </em>
<u>x=2</u>
Answer:
-3 celcius
Step-by-step explanation:
Answer:
D
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
The square oh the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
h² = (9
)² + (9 )² = 162 + 162 = 324 ( take the square root of both sides )
h = 
= 18 → D
