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2 years ago

8x+ 7y =39 8x + 2y = 34 What is x and y

Mathematics

1 answer:

anygoal [31]2 years ago

7 0

Answer:

y= 1 and X=4

Step-by-step explanation:

8x +7y =39

8x +2y =34

elimination method(we multiply 8x+7y=39 or 8x + 2y= 34 by -1 to eliminate 8x)

lets multiply 8x+7y = 39 by - 1

-8x -7y = -39

8x +2y = 34

(8x-8x)+(2y-7y)= (-39+34)

0 + (-5y) = -5

-5y= -5......dividing both sides by -5

 y = 1

8x +2y =34....... substituting y by 1

8x +2(1)= 34

8x + 2= 34

8x = 34-2

8x = 32.....dividing both sides by 8

x = 4

Lets check;

8x +2y = 34

8(4) +2(1) = 34

32 + 2 =34

34 = 34

8x + 7y = 39

8(4) + 7(1) = 39

32 + 7 =39

39 = 39

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