Question

I need help on this.

Answer 1

If the triangles are similar, the proportion of the legs on the left to the legs on the right will be equal.  This proportion would look like:

$\frac{2x+1}{3x}=\frac{10}{14}$

(You needed to combine the orange segment and the yellow segment to find the total length of the large triangle).

Now, cross multiply and solve for x:

28x+14=30x

*Subtract 28x from both sides to isolate the variable*

14=2x

*Divide both sides by 2*

7=x

Hope this helps!!