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Temka [501]
3 years ago
9

If x-y=4 and 2x+3y=10 what is the value of 3x+2y

Mathematics
2 answers:
g100num [7]3 years ago
4 0

x-y=4       2x+3y=10     find: 3x+2y

FIrst you need to figure out what either x or y equals with one of the equations. It doesn't matter which, because they are dependent on eachother and will both give the same number at the end.

I chose to go with the first equation, because it was simplier, which makes it easier to find the first variable. Again you can solve for either x or y first, I chose x

x-y=4

becomes

x=4+y

now we can plug this x value into the second equation of 2x+3y=10 to find

2(4+y)+3y=10

8+2y+3y=10

8+5y=10

solving for y

5y=2

y=2/5

Now we can plug this y value into the first equation to get an actual value of x

x-(2/5)=4

x=4+2/5

x=22/5

since we now have both x and y values, x=22/5 y=2/5, we can plug them into the 3rd equation to find what it equals

3(x)+2(y)=??

3(22/5)+2(2/5)=??

66/5+4/5=??

70/5=14

deff fn [24]3 years ago
3 0

Value of 3x + 2y is 14

Step-by-step explanation:

  • Step 1: Given 2 equations are x - y = 4 and 2x + 3y = 10. Multiply the first equation by 2 to make the coefficients equal.

2x - 2y = 8

2x + 3y = 10

  • Step 2: Subtract the second equation from the first equation.

⇒ - 5y = -2

∴ y = 2/5

⇒ x - 2/5 = 4

∴ x = 4 + 2/5 = 22/5

  • Step 3: Find the value of 3x + 2y

⇒ 3x + 2y = 3 × 22/5 + 2 × 2/5 = 66 + 4/5 = 70/5 = 14

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3 years ago
Fred has 30 minutes to do a three-problem quiz. He spent 10 7/10 minutes on question a and 5 2/5 minutes on question b. How much
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Answer:Fred has 13 9/10 minutes left for question C

Step-by-step explanation:

The total time that Fred has to do the three-problem quiz is 30 minutes.

He spent 10 7/10 minutes on question A. Converting 10 7/10 minutes to improper fraction, it becomes 107/10 minutes.

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