Answer:
(3, - 1 )
Step-by-step explanation:
Given the 2 equations
3x + y = 8 → (1)
7x - 4y = 25 → (2)
Multiplying (1) by 4 and adding to (2) will eliminate the y- term
12x + 4y = 32 → (3)
Add (2) and (3) term by term to eliminate y
19x + 0 = 57
19x = 57 ( divide both sides by 19 )
x = 3
Substitute x = 3 into either of the 2 equations and solve for y
Substituting into (1)
3(3) + y = 8
9 + y = 8 ( subtract 9 from both sides )
y = - 1
solution is (3, - 1 )
The probability of picking a purple marble is 50% or 1/2
[8x-2y]+[3x-4y]
=8x+3x-2y-4y
=11x-6y
Answer:
$680
Step-by-step explanation:
original price=$800
discount = 15%
discount in dollars= $800 *15%
discount=$120
cost=$800-$120
cost=$680
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