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{:[y=6x-30],[y=x^(2)-18 x+114]:}
If 
(a,b) is the solution to the system of equations shown, what is the value of 
b ?

y=6x30 y=6 x-30 \newliney=x218x+114 y=x^{2}-18 x+114 \newlineIf (a,b) (a, b) is the solution to the system of equations shown, what is the value of b b ?

Full solution

Q. y=6x30 y=6 x-30 \newliney=x218x+114 y=x^{2}-18 x+114 \newlineIf (a,b) (a, b) is the solution to the system of equations shown, what is the value of b b ?
  1. Write Equations: Write down the system of equations.\newlineWe have the following system of equations:\newliney=6x30y = 6x - 30\newliney=x218x+114y = x^2 - 18x + 114
  2. Set Equal: Set the two equations equal to each other to find the xx-coordinate of the intersection point(s).6x30=x218x+1146x - 30 = x^2 - 18x + 114
  3. Rearrange & Solve: Rearrange the equation to set it to zero and solve for xx.x218x+1146x+30=0x^2 - 18x + 114 - 6x + 30 = 0x224x+144=0x^2 - 24x + 144 = 0
  4. Factor Quadratic: Factor the quadratic equation.\newline(x12)2=0(x - 12)^2 = 0
  5. Solve for x: Solve for x.\newlinex12=0x - 12 = 0\newlinex=12x = 12
  6. Substitute & Find y: Substitute the value of xx into one of the original equations to find the value of yy.\newliney=6x30y = 6x - 30\newliney=6(12)30y = 6(12) - 30\newliney=7230y = 72 - 30\newliney=42y = 42