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7-3(4-2x)-10x 4(4)-2x)-10x 16-8x-10 16-18x
Which expression is equivalent to
-2/3(12x + 3y) -4(7x +7)?
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If 10x divided by 2 equals 7 what is the vaule of 2x?
10x ÷ 2 = 7 → 10x = 2 × 7 → x = (2 × 7) ÷ 10 → 2x = 2 × (2 × 7) ÷ 10 = 2.8
What expression is equivalent to (4 and minus7)(2x and minus1)(4-7)(2x-1)?
It is 3 - 14x
Ten times a number increased by 5 is greater than twelve times a number decreased by one?
10x + 5 > 12x - 2 7 > 2x 7/2 > x
Which is equivalent to 3x divide by 7 plus 5y divided by 14x?
3x/7 + 5y/14x = 3x*2x/(7*2x) + 5y/14x = (6x2 + 5y)/14x
What is the ordered pair for 2x plus 5y equals 16 plus -5x minus 2y equals 2?
2x + 5y = 16 + (-5x) - 2y = 2 That gives 2x + 5y = 2 . . . . . . . . . . (I) and -5x - 2y = - 14 or 5x + 2y = 14 . . . . (II) (I)*5: 10x + 25y = 10 (II)*2: 10x + 4y = 28 Subtracting the second from the first, 21y = -18 so y = -18/21 = -6/7 and then by (I) x = 1 - 5y/2 = 1 - 5/2*(-6/7) = 1 + 15/7 = 22/7 So the ordered pair is (22/7, -6/7)
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