-8x-6y=-18
If you mean: x+7y = 39 and 3x-2y = 2 Then by substitution: x = 4 and y = 5
x + 7y = 39 So x = 39 - 7y Substitute for x in the second equation: 3(39 - 7y) - 2y = 2 117 - 21y - 2y = 2 115 = 23y y = 5 Substitute this value for y back into the first equation: x + 7*5 = 39 x + 35 = 39 x = 4
y2+7y=18 y2+7y-18=0 (y+9)(y-2)=0 y=-9 & y=2
(9,6)
39 - 7y = 18,-7y = 18 - 39-7y = -21-7y/-7 = -21/-7y = 3
18=39-7y minus 18 from both sides (0=21-7y) subtract 21 from both sides to get the variable and the number on opposite sides -21=-7y -21/-7y= ____ y= ___
-8x-6y=-18
If you mean: x+7y = 39 and 3x-2y = 2 Then by substitution: x = 4 and y = 5
x + 7y = 39 So x = 39 - 7y Substitute for x in the second equation: 3(39 - 7y) - 2y = 2 117 - 21y - 2y = 2 115 = 23y y = 5 Substitute this value for y back into the first equation: x + 7*5 = 39 x + 35 = 39 x = 4
y2+7y=18 y2+7y-18=0 (y+9)(y-2)=0 y=-9 & y=2
(7,12)
(9,6)
7y+3=y+18 Subtract three 7y=y+15 Subtract y 6y=15 Divide Y=15/6 That's your fraction if you need a decimal just type it in the calculator...
3x + 7y = 3*x + 7*y = 3*6 + 7*4 = 18 + 28 = 46
14x+7y=-9
From first equation: x = 39 - 7ySubstitute this in second equation: 3(39 - 7y) - 2y = 2ie 117 - 21y - 2y = 2ie 115 = 23yie y = 5, making x = 4.