X+7y=0 (a)
2x-8y=22 (b)
1st write te 2 equation in terms of x
(a) x+7y=0 , then x= -7y
(b) 2x-8y=22 → 2x = 22 + 8y and x = 22/2 +8y/2 OR x = 11 + 4y
x = 11+4y and x = -7y Then 11 + 4y = -7y
Now we can extract the value of y:
11+4y = -7y
1st Add +7y to each side →11+4y+7y = -7y + 7y
11+ 11y = 0 . Now subtract 11 from both sides :→11+11y -11 = 0-11
11y = -11 and y = - 1
To find the value of x, replace the value of y (= - 1) in any of the given equation and you will find x = 7
Does this helped you?
C and D. same shape and side
The jar starts out with 8 marbles in it. Five of them are red.
If you don't peek, the probability of drawing a red marble is
5/8 .
If you have already drawn a red marble on the first try, then
at that point, the jar has only 7 marbles in it, and three of them
are green. Now, for your second draw, if you don't peek, the
probability of drawing a green marble is
3/7 .
The probability of BOTH of those events being successful is
(5/8) x (3/7) = 15/56 = approx 26.79% .
-5x^2(small two at top ) +9
