Substitution Success: Solve for x and y in x + 4y = 5 - 3y, 2x + 3y = 6

Question

Find the value of x and and band the substitution method.

{x+4y=53y2x+3y=6 \begin{cases} x+4y=5-3y \\ 2x+3y=6 \end{cases}

Video Solution

Step-by-Step Solution

To solve the given system of equations using the substitution method, follow these steps:

  • Step A: Simplify and solve the first equation for x x .
    Given: x+4y=53y x + 4y = 5 - 3y
    Combine like terms: x+4y+3y=5 x + 4y + 3y = 5 x+7y=5 x + 7y = 5
    Now solve for x x : x=57y x = 5 - 7y

  • Step B: Substitute this expression for x x in the second equation: 2x+3y=6 2x + 3y = 6
    Substitute x=57y x = 5 - 7y : 2(57y)+3y=6 2(5 - 7y) + 3y = 6
    Expand and simplify: 1014y+3y=6 10 - 14y + 3y = 6 1011y=6 10 - 11y = 6 11y=610 -11y = 6 - 10 11y=4 -11y = -4
    Solving for y y : y=411=411 y = \frac{-4}{-11} = \frac{4}{11}

  • Step C: Substitute y=411 y = \frac{4}{11} back into the equation for x x : x=57(411) x = 5 - 7(\frac{4}{11}) x=52811 x = 5 - \frac{28}{11}
    Convert 5 to an equivalent fraction: x=55112811 x = \frac{55}{11} - \frac{28}{11} x=2711 x = \frac{27}{11}

The solution to the system of equations is x=2711 x = \frac{27}{11} and y=411 y = \frac{4}{11} .

Answer

x=2711,y=411 x=\frac{27}{11},y=\frac{4}{11}