7x + 7 + 6x - 9 = 13x - 2
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7+10+(-6x)=17-6x
If you mean: y = 6x-4 and y = 7x-7 then by substitution x = 3 and y = 14
7 plus 7x--2x plus 3 is: 7 + 7x + 2x + 3 = 0 9x + 10 = 0 9x = -10 x = -10/9 = -1 1/9
4x + 7 = 6x -7 14=2x so x = 7 (plus a negative # is simply - that number)
6x2 + 7x = 56x2 + 7x - 5 = 0x =[ -7 ± √[72 - 4(6)(-5)] ]/2(6)x = [-7 ± √(49 + 120)]/12x = (-7 ± √ 169)/12x = (-7 ± 13)/12x = (-7 + 13)/12 or x = (-7 - 13)/12x = 6/12 = 1/2 orx = -20/12 = - 5/3