Suppose 3x + 4y = 52 and 5x + y = 30. What is the value of 8x – 2y?
es )
A6
B)
8
Submit

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

14

step-by-step explanation:

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls