Question

if 3x+3y=7 and 8x+7y=12 what is average of x and y

36
3.6
1.8
none of these​

Answer 1

Answer:

None of these

Step-by-step explanation

3x+3y=7

3(x+y)=7

x+y=7/3

x+y=3.4(approax)

x=3.4-y......1)

8x+7y=12

8(3.4-y)+7y=12

27.2-8y+7y=12

-y=12-27.2

-y= -15.2

y=15.2

1)x=3.4-y

x=3.4-15.2

x= - 11.8