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scZoUnD [109]
3 years ago
14

What is the solution to the system of equations below? 5 x + 2y = -3 3x + 6y = 6

Mathematics
1 answer:
Orlov [11]3 years ago
3 0
Eqn (1)*3: 15x + 6y = -9 -> Eqn (3)
Eqn (3) - Eqn (2): 12x = -15
x = -5/4 = -1 1/4
Eqn (2): -15/4 + 6y = 6
6y = 9 3/4
y = 1 5/8

x = -1 1/4
y= 1 5/8
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Which statement is true about the tree represented by the point on the graph?
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Carson bought a coat for 40% of the original price, then another 15% off the discounted price. If the coat originally cost $149,
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5 0
3 years ago
Justin recently drove to visit his parents who live 96 miles away. On his way there his average speed was 20 miles per hour fast
never [62]

Answer:

Justin's average speed to his parents' house: x= 40mph

Justin's average speed from his parents' house: x+20=60 mph

Step-by-step explanation:

Let the average speed be x +20  

Then average speed from his parents' x

And the distance is S=96

Then we know :

\displaystyle \frac{S}{x+20} +\frac{S}{x} =4 \\\\\\ \frac{96}{x+20} +\frac{96}{x}=4   \ |\div 4 \\\\\\ 24\bigg(\frac{1}{x+20} +\frac{1}{x} \bigg) =1 \\\\\\ 24\cdot \frac{x+x+20}{(x+20)x}  =1  \  |\cdot (x+20)x  \ \  \\\\\\48x+480=x^2+20x \\\\ x^2-28x-480=0  \\\\  \rm  D=28^2+4\cdot 480=2704 =52^2 \\\\ \boxed{x_1=\frac{28+52}{2} =40} \\\\x_2=\frac{28-52}{2} =-12 \ \  \varnothing

Justin's average speed to his parents' house:  x= 40mph

Justin's average speed from his parents' house:  x+20=60 mph

4 0
3 years ago
Need the answer on this ​
denpristay [2]
None of the answers are correct because it’s definitely not “Given” because x=20 is like an answer. It’s also not “Distributive Property”, “subtraction Property”, and or “Additional Property” b/c there’s nothing that can be distributed, subtract or add. It’s just an answer.
3 0
3 years ago
Read 2 more answers
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