Question

-4x -3y =9 and 5x=15 solve by substitution. SHOW WORK PLS

Answer 1

`\sf{\boxed{\sf{x=3, \quad y=-7}}}`

Explanation:

In order to solve the problem, all you have to do is substitute the left to right numbers in the equation.

-4x-3y=9 and 5x=15

Solve with 5x=15.

First, divide by 5 from both sides.

5x/5=15/5

Solve.

15/5=3

x=3

Substitute of x=3.

-4*3-3y=9

Solve.

-4*3=-12

Then rewrite the problem down.

-12-3y=9

You have to isolate by the y.

-12-3y=9

Add by 12 from both sides.

-12-3y+12=9+12

Solve.

9+12=21

-3y=21

Then, divide by -3 from both sides.

-3y/-3=21/-3

Solve.

21/-3=-7

y=-7

As a result, the solution is x=3, and y=-7, which is our answer.