soal SPLKDV dengan metode subtitusi {y=x²-6x+9} {y=2x-7}

y = y
x² - 6x + 9 = 2x - 7
x² - 6x - 2x + 9 + 7 = 0
x² - 8x + 15 = 0
(x - 5)(x - 3) = 0
x = 5 atau x = 3
y = 2(5) - 7 = 10-7 = 3
atau
y = 2(3) - 7 = -1