3
x-y = 6 -x-3y = 22 -4y = 28 y = -7 So by substituting: x = -1 and y = -7
15 + 14 + 14 + 11 + 2x + x = 75 Collect like terms 54 + 3x = 75 Subtract 54 3x = 21 Divide by 3 x = 7 ■
x=3 and y=4. you multiply x+y=7 by neg. 2 this way you can cancel out the y factors and get neg. 2x+x=-14+11 neg. x = neg. 3 divide both sides by neg. 1 to get x=3. use substitution to get y=4
y=7+x =x=7-x
x-7+7=11+7 x=11+7 x=18
x=-(29/11)
-8 x -11 + (-22) = 88 - 22 = 66
11+2 = 13 and 2*11 = 22 So: x2+13x+22 = (x+2)(x+11) when factored
-8 x -11 + (-22) = 88 - 22 = 66
3 x 7 = 21 2 x 11 = 22 because 3 x 7 = 21 2 x 11 = 22
x/11 + 21 = 7 x/11 = -14 x = -154
x/11 + 21 = 7 x/11 = -14 x = -154
2772. 308 = 22 x 7 x 11 252 = 22 x 32 x 7 198 = 2 x 32 x 11 lcm = 22 x 32 x 7 x 11 = 2772
Where is y in the first equation, you put its equivalent (=) -3x + 11 The first equation is then transformed into: 3x + 2*(-3x + 11) = 7. Then you get: 3x + (-6x) + 2*11 = 7 <=> -3x + 22 = 7 <=> 22 - 7 = 3x <=> 3x = 15 <=> x = 15/3 <=> x = 5. Then you substitute the x in the second equation by its equivalent so, (x = 5) y = -3*x + 11 <=> y = -3*5 + 11 <=> y = -15 + 11 <=> y = -4. x = 5. y = -4.
22/77 in simplest form is 2/7, because 22/77 = 2 x 11 / 7 x 11 = 2/7
22 66 = 2 x 3 x 11 154 = 2 x 7 x 11 gcf = 2 x 11 = 22