The correct first step to solving the system of equations in the most efficient manner is x = -4y +19.
The given system of equations is;

<h2>What is the first step to solving an equation?</h2>
The first step would be to rearrange the variables in the second equation so we have a defined expression for x.
We would want to do this so we could then plug in the defined expression for x into the other equation and solve for the other variable.
x + 4y = 19
Rearrange this by getting the 4y to the other side.
We can get 4y on the other side by subtracting 4y from both sides
x + 4y - 4y = 19 - 4y
x = -4y + 19
Hence, the correct first step to solving the system of equations in the most efficient manner is x = -4y +19.
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brainly.com/question/15240525
Answer:
C = 3n+8
Step-by-step explanation:
you multiply $3 times the number of students and then add $8 for the advisor to get the total cost.
H=(√3)*a/2 = 41.2
So, a=2*41.2/√3=47.6
Answer:
43.33 km
Step-by-step explanation:
<u>Step 1: Find the amount of km Sarah can run in 1 hour</u>
26/3
<u>Step 2: Find the amount of km Sarah ran in 5 hours</u>
26/3 * 5
130/3
43.33
Answer: 43.33 km
Answer:
(-2,6)
Step-by-step explanation: