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irakobra [83]
3 years ago
9

Solve for the variables: 3x-4y=17 x-4y=3

Mathematics
2 answers:
dem82 [27]3 years ago
7 0

Answer:

3x - 4y = 17ndx - y = 3 \\ 3x - x - 4y + 44y = 17 - 3 \\ 3x - x = 17 - 3 \\ 2x = 17 - 3 \\ 2x = 14 \\ x = 7 \\  \\ 7 - 4y = 3 \\  - 4y =  - 4 \\ y = 1

Tpy6a [65]3 years ago
7 0

Answer:

x = 7

y = 1

Step-by-step explanation:

3x - 4y = 17

x - 4y = 3

Solve x in the second equation.

x = 3 + 4y

Put x as 3 + 4y in the first equation and solve for y.

3(3 + 4y) - 4y = 17

9 + 12y - 4y = 17

9 + 8y = 17

8y = 17 - 9

8y = 8

y = 8/8

y = 1

Put y as 1 in the second equation and solve for x.

x = 3 + 4(1)

x = 3 + 4

x = 7

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work :

1-multiply the numbers by a submultiple of 10 to remove the decimal points.
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2-

now do the division :
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so the answer is 19



note: there is no need to get it back to decimal number unless you multiply just one of the numbers or multiply the numbers with different submultiples of 10



good luck
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