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Find the solution of the system of equations.

{:[-4x-8y=-20],[8x+3y=1]:}

Find the solution of the system of equations.\newline4x8yamp;=208x+3yamp;=1 \begin{aligned} -4 x-8 y & =-20 \\ 8 x+3 y & =1 \end{aligned}

Full solution

Q. Find the solution of the system of equations.\newline4x8y=208x+3y=1 \begin{aligned} -4 x-8 y & =-20 \\ 8 x+3 y & =1 \end{aligned}
  1. Elimination Method: Let's start by solving the system of equations using the method of elimination or substitution. We will use elimination in this case. First, we need to make the coefficients of one of the variables the same in both equations so we can eliminate that variable. We can multiply the second equation by 44 to match the coefficient of xx in the first equation.\newlineCalculation: (8x+3y=1)×4(8x + 3y = 1) \times 4\newlineNew system of equations:\newline4x8y=20-4x - 8y = -20\newline32x+12y=432x + 12y = 4
  2. Adding Equations: Now, we add the two equations together to eliminate xx.\newlineCalculation: (4x8y)+(32x+12y)=20+4(-4x - 8y) + (32x + 12y) = -20 + 4\newlineNew equation: 28y=1628y = -16
  3. Solving for y: Next, we solve for y by dividing both sides of the equation by 2828.\newlineCalculation: 28y28=1628\frac{28y}{28} = \frac{-16}{28}\newliney = 1628-\frac{16}{28}\newliney = 47-\frac{4}{7}
  4. Substitute Back: Now that we have the value of yy, we can substitute it back into one of the original equations to find xx. We'll use the first equation for this purpose.\newlineSubstitution: 4x8(47)=20-4x - 8(-\frac{4}{7}) = -20\newlineCalculation: 4x+327=20-4x + \frac{32}{7} = -20
  5. Clearing Denominators: To solve for xx, we first need to get rid of the fraction by multiplying every term by 77 to clear the denominators.\newlineCalculation: 7(4x)+7(327)=7(20)7(-4x) + 7(\frac{32}{7}) = 7(-20)\newline28x+32=140-28x + 32 = -140
  6. Move 3232: Next, we move 3232 to the other side of the equation by subtracting it from both sides.\newlineCalculation: 28x=14032-28x = -140 - 32\newline28x=172-28x = -172
  7. Final Solution: Finally, we solve for xx by dividing both sides of the equation by 28-28.
    Calculation: x=172/28x = -172 / -28
    x=172/28x = 172 / 28
    x=43/7x = 43 / 7