Solve y = 4x – 17 3x + y = 4 with the substitution method PLEASE HELP

Mathematics

2 answers:

expeople1 [14]3 years ago

7 0

Answer:

Step-by-step explanation:

y = 4x – 17..........(1)

3x + y = 4............(2)

Substituting y = 4x - 17 in (2)

3x + 4x - 17 = 4

7x = 4 + 17

7x = 21

x = 21/7

x = 3

Putting x = 3 in equation (1)

y = 4x - 17

y = 4(1) - 17

y = 4 - 17

y = -13

Firdavs [7]3 years ago

3 0

Hey! :)

First, let us learn about substitution.

Let's say we have an equation 3x + 1y = 1 and 1x + 2y = 6

You need to pick one equation to solve for x.

Let's say we picked 1x + 2y = 6 for x to solve for y.

Then you'd solve.

Now onto the equation.

- Substitute 4x−17 for y in 3x+y=4:

3x+y=4

3x+4x−17=4

7x−17=4 - Simplify both sides.

7x−17+17=4+17 Let's add 17 to both sides.

7x=21

Divide both sides by 7.

7x/7 = 21/7

x = 3

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