Oh, dude, let's break it down. So, if x equals 6 and y equals 8, we just plug those values into the expression. 9 times 6 is 54, and 10 times 8 is 80. Add those up, and you get 134. Ta-da!
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9x+6 = 7x+18 9x-7x = 18-6 2x = 12 x = 6
9x + 4 = 6 9x = 6 -4 9x = 2 x = 2/9
y= 3/6 which reduces to 1/2
9x + 3x - 9x = 6 + 8x - 113x = 8x - 11-5x = -11x = 2.2 or 11/5
9x + 7 = 15x + 1 ___-1_______-1 9x + 6 = 15x -9x_____-9x ____6=6x ____/6_/6 ____1=x x equals 1.