What is the best first step for solving the given system using substitution while avoiding fractions -9x+4y=10 -9x+3y=3

The best first step for solving the given system using substitution is substitute the value of -9x from equation 1 in equation 2

Step-by-step explanation:

Given :

To Find: What is the best first step for solving the given system using substitution?

Solution:

 --1

  --2

Since we are supposed to solve these equations using substitution method

So, the first best step for solving the equation is :

Both the equations contains -9x

So, substitute the value of -9x from equation 1 in equation 2

Substitute the value of y in 1 to get value of x

So,    

Thus the solution is (2,7)

Hence the best first step for solving the given system using substitution is substitute the value of -9x from equation 1 in equation 2

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.