Question

Use the substitution method to solve the system of equations. Choose the
correct ordered pair.
y = 3x - 4
x = 9
O A. (9,31)
O B. (1,-1)
O c. (0,-4)
O D. (9,23)

Answer 1

Answer:

D:  (9, 23)

Step-by-step explanation:

Substitute the given value, 9, for x in y = 3x - 4.  We get:

y = 3(9) - 4, or y = 23.  Thus, the solution is (9, 23) (Answer D)

Answer 2

D. (9, 23) is the required ordered pair.

What is substitution method ?

Substitution method is a mathematical method in which we have to pick one variable from one equation and substitute it to another equation.

How to solve the given problem ?

Given equations are,

y = 3x - 4  .....(1)  &  x = 9   .....(2)

By using substitution method,

We have to put the value of x of (2) in (1),

i.e. we have to put x = 9 in (1),

∴ y = (3×9) - 4

     = 27 - 4

     = 23

So, the required ordered pair is (9, 23)

Learn more about substitution method here :

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