9x+4 =x-7 8x=-3 x=-3/8
Multiply the first equation by 3 to give 9x + 15y = 21
9x + 5 = 4x + 3 Subtract 4x from both sides: 5x + 5 = 3 Subtract 5 from both sides: 5x = - 2 Divide both sides by 5: x = -2/5 or -0.4
9x - 3(x + 13y) = 9x - 3x - 39y = 6x - 39y = 3(2x - 13y)
(2x+3)(x+3)
Do a bit of rearrangement: 1: 10x + 2 = 8y; 2: 8y = 59 - 9x so 10x + 2 = 59 - 9x so 19x - 57 making x = 3 and y is therefore 4.
y equals 3
Oh, dude, direct variation is when two variables change in the same way. In this case, 5x + 3 = 8y + 3, so technically they are changing in the same way by adding 3 to both sides. So, yeah, I guess you could say it's a direct variation, but like, who really cares, right?
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17
9x + 3 - 6x - 2 = 3x + 1
If: 12 = 9x+3 Then: 12-3 = 9x And: 9 = 9x So: x =1
(2, 3)
-9x-25=3 -9x=28 9x=-28 x=-28/9
2x+3=9x 3=9x-2x 3=7x x=3/7
-20 + 9x = -17-20 + 17 = -9x-3 = -9x |: (-9)0.333... = xx = 0.333...
74 (10*5)+(8*3) = 74