Which of the following is usually the last step in solving a system of nonlinear equations by substitution ?

B

Step-by-step explanation:

Substitute the value(s) from Step 3 into either equation to solve for the other variable.

Hence, Option 'B' is correct.

Step-by-step explanation:

Methods of solving the systems of non linear equations:

So, the last step would be Option 'B'.

Hence, Option 'B' is correct.

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.