Question

Suppose 3x + 4y = 52 and 5x + y = 30. What is the value of 8x – 2y?

es )
A6
B)
8
Submit

Answer 1

5x+y=30

y=30-5x

3x+4(30-5x)=52

3x+120-20x=52

-17x+120=52

-17x=-68

x=4

5(4)+y=30

20+y=30

y=10

8(4)-2(10)

32-20

12

So the value of 8x-2y is 12 where x=4 and y=10