Hello, can someone help with these problems. Simplify:
3x+9-4x
2(3-4x)+5
(3x+5)- 2(8x+3)
(2x+3y-4) - (3x+5y+6)
3(2x-4y+8) -5x -4
Thx!!

one solution: (2.5, 0)

Step-by-step explanation:

Given the following system of equations;

y = 2x - 5

-8x - 4y = -20

To find the solution to the equations, we would use the substitution method;

Substituting eqn 1 into eqn 2, we have;

-8x - 4(2x - 5) = -20

-8x - 8x + 20 = -20

-16x + 20 = -20

-16x = -40

x = 40/16

x = 2.5

Next, we would determine the value of y;

y = 2x - 5

y = 2(2.5) - 5

y = 5 - 5

y = 0