Let 11x + 15y + 23 = 0 be equation (1)
And 7x - 2y - 20 = 0 be equation (2)
Multiply equation (1) by 2:
22x + 30y + 46 = 0
Multiply equation (2) by 15:
105x - 30y - 300 = 0
Add equations (1) and (2):
22x + 105x + 30y - 30y + 46 - 300 = 0
127x - 254 = 0
127x = 254
x = 254/127
[x = 2]
Substitute x = 2 in equation (1) to find y:
11(2) + 15y + 23 = 0
22 + 15y + 23 = 0
15y + 45 = 0
15y = -45
y = -45/15
y = -3
Therefore, x = 2 and y = -3.
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Alyssa has 18 quarters.
If she saved 9 quarters each car wash and she went through the car wash twice than 2x9 equals 18
(x^2 - 9)(x + 2) = 0
(x - 3)(x + 3)(x + 2) = 0
As any of the 3 above factors can equal zero the solutions are
x = 3, -3 , -2.
So the answer is E.
Answer:
24$
Step-by-step explanation:
12m/1.5m=8 8*3=24