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1. 8x+6y= 16 y = 4 8x+6(4) = 16 8x + 24 =16 8x = -8 x = -1 (-1,4) 3. -x - 4y = 20 y = -6x + 18 -X-4 (-6x+18)=20 -X +24 x - 72=20 23x - 72=20 23x = 92 X= 4 5. 3x-y=7 y = 5x-13 3x-(5x-13) = 7 3x-5x+13=7 -2x+13=7 -2x = -6 x= 3 Substitution Practice (3,2) y=-6(4)+18 y=-24+18 9-=6 (4,-6) y = 5(3)-13 y-15-13 y = 2 2. x = -2 -4x + 4y = -16 -4 (-2) + 4y = 16 8 +4у=16 ну 4. y = x - 20 x+y=84 = -24 y = -6 (-2,-6) X+ (x-20) X+X-20-84 2x-20=84 2x = 104 X = 52 6. x = 6-4y 2x - 3y = 1 2(6-4y)-3y = 1 12-84-39=1 12-11y = 1 -lly = +18= = -11 y=1 y=52-20 y= 32 (52,32) x=6-4(1) x=6-4 x = 2 |(2,1) Name 7. 3x + y = 4y=-3x+4 6x + 2y = 7 6x+2 (-3x+4)= 7 6X-6X +8 = 7 8=7 False No solution 9. -3x+y=7y= 3x + 7 2x-3y = 7 2x-3 (3x+7)=7 2x9x-21 = 7 -7x-21 = 7 -7x = 28 x = 4 y=3(-4)+7 y=-12+7 y=-5 (-4,-5) 11. 3x+y=-19 y=-3x-19 2x + 5y = -4 2x+5 (-3x-19) = -4 2x-15X 95 = -4 - 13x-95 = - 4 -13x = 91 X = -7 Period A B C D E F Date 8. y = 3x - 6 -3x + y = -6 -3x + (3x-6)=-6 -3x + 3x -6=-6 (-7,2) -6=-6 True Infinite Solutions 10. x-3y=9x=3y+9 2x + 3y = -9 2 (3y+9) + 3y = -9 6y +18 +3y=-9 y=-3(-7)49 y = 21-19 у 9y+18 = -9 ау = -27 =-3 y=- x=3(-3)+9 x = -9+9 x = 0 (0,-3)
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1. 8x+6y= 16 y = 4 8x+6(4) = 16 8x + 24 =16 8x = -8 x = -1 (-1,4) 3. -x - 4y = 20 y = -6x + 18 -X-4 (-6x+18)=20 -X +24 x - 72=20 23x - 72=20 23x = 92 X= 4 5. 3x-y=7 y = 5x-13 3x-(5x-13) = 7 3x-5x+13=7 -2x+13=7 -2x = -6 x= 3 Substitution Practice (3,2) y=-6(4)+18 y=-24+18 9-=6 (4,-6) y = 5(3)-13 y-15-13 y = 2 2. x = -2 -4x + 4y = -16 -4 (-2) + 4y = 16 8 +4у=16 ну 4. y = x - 20 x+y=84 = -24 y = -6 (-2,-6) X+ (x-20) X+X-20-84 2x-20=84 2x = 104 X = 52 6. x = 6-4y 2x - 3y = 1 2(6-4y)-3y = 1 12-84-39=1 12-11y = 1 -lly = +18= = -11 y=1 y=52-20 y= 32 (52,32) x=6-4(1) x=6-4 x = 2 |(2,1) Name 7. 3x + y = 4y=-3x+4 6x + 2y = 7 6x+2 (-3x+4)= 7 6X-6X +8 = 7 8=7 False No solution 9. -3x+y=7y= 3x + 7 2x-3y = 7 2x-3 (3x+7)=7 2x9x-21 = 7 -7x-21 = 7 -7x = 28 x = 4 y=3(-4)+7 y=-12+7 y=-5 (-4,-5) 11. 3x+y=-19 y=-3x-19 2x + 5y = -4 2x+5 (-3x-19) = -4 2x-15X 95 = -4 - 13x-95 = - 4 -13x = 91 X = -7 Period A B C D E F Date 8. y = 3x - 6 -3x + y = -6 -3x + (3x-6)=-6 -3x + 3x -6=-6 (-7,2) -6=-6 True Infinite Solutions 10. x-3y=9x=3y+9 2x + 3y = -9 2 (3y+9) + 3y = -9 6y +18 +3y=-9 y=-3(-7)49 y = 21-19 у 9y+18 = -9 ау = -27 =-3 y=- x=3(-3)+9 x = -9+9 x = 0 (0,-3)
1. 8x+6y= 16 y = 4 8x+6(4) = 16 8x + 24 =16 8x = -8 x = -1 (-1,4) 3. -x - 4y = 20 y = -6x + 18 -X-4 (-6x+18)=20 -X +24 x - 72=20 23x - 72=20 23x = 92 X= 4 5. 3x-y=7 y = 5x-13 3x-(5x-13) = 7 3x-5x+13=7 -2x+13=7 -2x = -6 x= 3 Substitution Practice (3,2) y=-6(4)+18 y=-24+18 9-=6 (4,-6) y = 5(3)-13 y-15-13 y = 2 2. x = -2 -4x + 4y = -16 -4 (-2) + 4y = 16 8 +4у=16 ну 4. y = x - 20 x+y=84 = -24 y = -6 (-2,-6) X+ (x-20) X+X-20-84 2x-20=84 2x = 104 X = 52 6. x = 6-4y 2x - 3y = 1 2(6-4y)-3y = 1 12-84-39=1 12-11y = 1 -lly = +18= = -11 y=1 y=52-20 y= 32 (52,32) x=6-4(1) x=6-4 x = 2 |(2,1) Name 7. 3x + y = 4y=-3x+4 6x + 2y = 7 6x+2 (-3x+4)= 7 6X-6X +8 = 7 8=7 False No solution 9. -3x+y=7y= 3x + 7 2x-3y = 7 2x-3 (3x+7)=7 2x9x-21 = 7 -7x-21 = 7 -7x = 28 x = 4 y=3(-4)+7 y=-12+7 y=-5 (-4,-5) 11. 3x+y=-19 y=-3x-19 2x + 5y = -4 2x+5 (-3x-19) = -4 2x-15X 95 = -4 - 13x-95 = - 4 -13x = 91 X = -7 Period A B C D E F Date 8. y = 3x - 6 -3x + y = -6 -3x + (3x-6)=-6 -3x + 3x -6=-6 (-7,2) -6=-6 True Infinite Solutions 10. x-3y=9x=3y+9 2x + 3y = -9 2 (3y+9) + 3y = -9 6y +18 +3y=-9 y=-3(-7)49 y = 21-19 у 9y+18 = -9 ау = -27 =-3 y=- x=3(-3)+9 x = -9+9 x = 0 (0,-3)
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Knowunity is the # 1 ranked education app in five European countries
Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.
Still not sure? Look at what your fellow peers are saying...
iOS User
I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D
Stefan S, iOS User
The application is very simple and well designed. So far I have found what I was looking for :D
SuSSan, iOS User