Solve using the elimination method:
X-3y=7
3x + 3y=9

Step-by-step explanation:

Given Equation:

     Equation:1

    Equation:2

Dividing Equation:2 by '3' both the sides:

or       Equation:3

Putting the vale of 'x' in Equation:1

Subtracting '3' both sides

Putting value of 'y' in Equation:3

The solution of the equations is :

instagram is better than go there instead lol

step-by-step explanation:

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.