Question

plz help me
find the solution to each system of equation by the substitution method.
4/7x +2/7y =2
3x+y =13

Answer 1

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Answer 2

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Answer 3

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Answer 4

cool :)

Answer 5

3x + y = 13 ---> y = 13 - 3x
now sub 13 - 3x in for y in the 1st equation...First lets get rid of the fractions
4/7x + 2/7y = 2 (multiply the equation by 7 to get rid of the fraction...
(7)4/7x + (7)2/7y = (7)2
4x + 2y = 14 (now sub 13 - 3x for y)
4x + 2(13 - 3x) = 14 (distribute the 2 through the parenthesis)
4x + 26 - 6x = 14 (combine like terms)
-2x + 26 = 14
-2x = 14 - 26
-2x = - 12
x = 6

now sub 6 in for x in the 2nd equation
3x + y = 13
3(6) + y = 13
18 + y = 13
y = 13 - 18
y = - 5

check...
4x + 2y = 14
4(6) + 2(-5) = 14
24 - 10 = 14
14 = 14 (correct)

ANSWER: x = 6 and y = -5 or (6,-5)

Answer 6

Do you have any questions ?

Answer 7

thanks a lot
I have more question
4/7x +2/7y=2
3x+y=13

Answer 8

solve by graphing
y=3/4x-2
y=1/3x +2/3

Answer 9

y-2x-6=0
1/2y-3=x

Answer 10

please help me as soon as possible