7x + 2y = 19
-x + 2y = 21
7x + 2y = 19
Subtract 2y from both sides
7x = 19 - 2y
Divide both sides by 7
x = (-2/7)y - (19/7)
x + 2y = 21
Substitute x for (-2/7)y - (19/7)
(-2/7)y - (19/7) + 2y = 21
Combine like terms
(12/7)y - (19/7) = 21
Add (19/7) to both sides
(12/7)y = (166/7)
Multiply both sides by (12/7)
y = (83/6)
x + 2y = 21
Substitute y for (83/6)
x + 2(83/6) = 21
Multiply 2 by (83/6)
x + (83/3) = 21
Subtract (83/3) from both sides
x = (-20/3)
x = (-20/3)
y = (83/6)
Answer:
255
Step-by-step explanation:
The n th term of a geometric series is
= a
where a is the first term and r the common ratio
1 ← is the n th term
with a = 1 and r = 2
The sum to n terms of a geometric series is
= , thus
=
= - 1 = 256 - 1 = 255
Answer:
find the value of x or do
(4x)2
Step-by-step explanation:
Daily fact:Noah's Ark is the vessel in the Genesis flood narrative through which God spares Noah, his family, and examples of all the world's animals from a world-engulfing flood. The story in Genesis is repeated, with variations, in the Quran, where the Ark appears as Safinat Nūḥ and al-fulk.
Answer: 9
Step-by-step explanation:
2X+5=3X-4
-2X. -2X
5= X-4
+4
9=X
418 roses and 239 tulips. (The real answer being 657, or the third choice down)