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Jlenok [28]
3 years ago
15

2 - 4x = 3x - 12 Solve for x

Mathematics
2 answers:
gavmur [86]3 years ago
8 0

Answer:

2 =x

Step-by-step explanation:

2 - 4x = 3x - 12

Add 4x to each side

2 - 4x+4x = 3x+4x - 12

2 = 7x-12

Add 12 to each side

2 +12 = 7x - 12+12

14 = 7x

Divide each side by 7

14/7 = 7x/7

2 =x

vova2212 [387]3 years ago
6 0

Answer:

x = 2

Step-by-step explanation:

Step 1: Write out equation

2 - 4x = 3x - 12

Step 2: Add 4x on both sides

2 - 4x + 4x = 3x + 4x - 12

2 = 7x - 12

Step 3: Add 12 on both sides

2 + 12 = 7x - 12 + 12

14 = 7x

Step 4: Divide both sides by 7

14/7 = 7x/7

2 = x

Step 5: Rewrite

x = 2

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Answer: the average speed is 7.5 mph or at least im pretty sure

Step-by-step explanation:

This is because if you make the 2 miles at 6 mph to 1 mile at 3 mph then you get 1 mile at 3mph and 1 mile at 12 mph. now that you have the unit rates of these you can add them. 1 + 1 = 2 miles and 3 + 12 = 15 mph now divide this by two and you get 7.5 mph per mile.

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2 years ago
What are the coordinates of the x-intercepts of the parabola y = x² - 8x + 15?
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Answer:

(3, 0) and (5, 0)

Step-by-step explanation:

we have

y=x^{2}-8x+15

we know that

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so

For y=0

x^{2}-8x+15=0

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

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x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}

in this problem we have

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substitute in the formula

x=\frac{-(-8)\pm\sqrt{-8^{2}-4(1)(15)}} {2(1)}

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x=3, x=5

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Step-by-step explanation:

Look it up

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