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{:[9x-9y=-18],[10 x-9y=-15]:}

9x−9y=−1810x−9y=−15 \begin{array}{l}9 x-9 y=-18 \\ 10 x-9 y=-15\end{array}

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Checkpoint: Rational and irrational numbersright chevron icon

Full solution

Q. 9x−9y=−1810x−9y=−15 \begin{array}{l}9 x-9 y=-18 \\ 10 x-9 y=-15\end{array}
  1. Eliminate y by subtracting equations: Subtract the first equation from the second to eliminate y.\newline(10x−9y)−(9x−9y)=−15−(−18)(10x - 9y) - (9x - 9y) = -15 - (-18)\newlinex=3x = 3
  2. Find xx value: Substitute x=3x = 3 into the first equation to find yy.9(3)−9y=−189(3) - 9y = -1827−9y=−1827 - 9y = -18−9y=−18−27-9y = -18 - 27−9y=−45-9y = -45y=5y = 5

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