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Title: Math problems help: solving variable? Post by: rjandmj82 on Oct 11, 2012 Can somone help me with the following problems and show step by step how to get the answer? Solve for the variable: 1. 2x-(5-x)=x-9
2. 2/3t +26=-37 3. 1/2(8-x)=2/3(x+9) 4. 3r-2(2r-1)=5(2r-4) 5. -4y+2-2(3y+2)=18 6. 5x+3+5(-2x-1)=23 7. 2x+2(5x-7)=10 8. 3(y+2)-1=5-(y-2) Title: Math problems help: solving variable? Post by: ilohim on Oct 11, 2012 Open up the brackets
1) 2x-5+x=x-9 ---> (2x+x)-5=x-9 ----> 3x-5=x-9 ---> 3x=(x-9)+5 ----> 3x=x-4 ---> 2x= -4 ----> x= -2 Bit quicker this time... 2) (2/3t)=-63 ----> 2=3t(-63) ----> 3t=2/-63 ----> t= -2/189 3) 4-(1/2)x = (2/3)x+6 ----> 4= (7/6)x +6 ------> -2 = (7/6)x --------> x= -12/7 4) 3r-4r+2=10r-20 -----> 2=11r-20 -----> 11r=22 ----> r=2 5) -4y+2-6y-4=18 ----> -10y-2=18 ----> -10y=20 y=-2 6) 5x+3-10x-5=23 ---> -5x-2=23 ------> -5x=25 ---> x=-5 7) 2x+10x-14=10 ----> 12x=24 ----> x=2 8) 3y+6-1= -5-y+2 ---> 4y=-8 ----> y=-2 |