Please help me !

Mathematics

2 answers:

Alik [6]3 years ago

8 0

Solve for x in the second equation first

kumpel [21]3 years ago

8 0

Answer:

Solve for x in the second equation.

Step-by-step explanation:

To solve a system of equations by substition you have to solve one of the equations for X or Y and then substitute that value on the X of the other equation, if you want to avoid fractions, you can use the x of the secon equation, like this:

$6x+18y=24\\6x=24-18y\\x=\frac{24-18y}{6} \\x=4-3y$

So by solving X for the second equation you avoided fractions when substituting the value for X on the first equation.

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2/3x - 1/6 > 1/2 Please sole and add equation in response if possible thanks :

Shkiper50 [21]

The solution would be x > 1 sorry if its wrong but hope it helps

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1 year ago

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How far from an airport can an airplane fly and return in 8 hours, if it's outgoing speed is 160 km per hour and it's returning

PilotLPTM [1.2K]

speed = distance/time
total time is 8 hours

outgoing speed is 160 km per hour,
so time = d/160

returning speed is 240 km per hour,
so time = d/240

d/160 + d/240 = 8

3d/480 + 2d/480 = 8
5d/480 = 8
5d =480 (8)
5d = 3840
d=3840/5
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answer: so the distance is 768 km

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2 years ago

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Use the table below of the function f(x) = x4 − 2x3 to answer this question: What is the average rate of change from x = −1 to x

stealth61 [152]

F (1) - f (-1) / 1- (-1) = -1 -3 / 1+1 = -4/2 = -2

/ are fractions the equal signs should break them up, hope this helps.

3 0

2 years ago

Write an equation of the line that passes through a pair of points:

Shalnov [3]

Answer:

Step-by-step explanation:

(-2,-2) , (5,-5)

$Slope=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}\\\\=\frac{-5-(-2)}{5-(-2)}\\\\=\frac{-5+2}{5+2}\\\\=\frac{-3}{7}\\$

(-2,-2), m= -3/7

Line equation: y -y1 =m*(x -x1)

y-(-2) = -(-3/7)(x - [-2])

$y+2=\frac{-3}{7}*(x+2)\\\\y+2=\frac{-3}{7}*x+(\frac{-3}{7})*2\\\\y+2=\frac{-3}{7}x-\frac{6}{7}\\\\y=\frac{-3}{7}x-\frac{6}{7}-2\\\\y=\frac{-3}{7}x-\frac{6}{7}-\frac{2*7}{1*7}\\\\y=\frac{-3}{7}x-\frac{6}{7}-\frac{14}{7}\\\\y=\frac{-3}{7}x-\frac{20}{7}$