# 4Tests Forums

**Author** |
**Topic** |

desireemilkman | Posted - 30 January 2002 3:43 i dont understand what the heck 2x+7=11 means nor do i understand how to do it!! :-( help |

dlandu | Posted - 8 February 2002 19:8 hi i''m happy to help.</P><P>when you are asked to solve 2x+7=11, what you do is:<BR>having 2x+7=11<BR>add(-7)to the left hand side and the right hand side of the equations to collect like terms<BR>i.e 2x+7-7=11-7<BR>this leaves you with<BR>2x=4<BR>then to find x, you divide both sides of the equation by 2<BR>i.e 2x/2=4/2<BR>working it out, you get:<BR>x=2</P><P>NOTE: If you want to be sure your answer is correct just substitute 2 for x in the equation 2x+7=11<BR>i.e (2*2)+7=11<BR>4+7=11<BR>this means that 2 is the answer.</P><P>i hope u understand my explanation |

shikhartandon | Posted - 12 April 2002 10:24 See the equation u have given is of the form ax+b=c where a , b , c are any three numbers.The equation acyually means find a number ''x'' such that if u multiply it with a and add b to the result then u should get c. And here x is given by the formula <BR> x = ( c-b)/a<BR> Try solving the equations for practice <BR> 3x+2=8<BR> 5x+5 = 15<BR> 9x+2 = 20</P><P> Here the number beside x xan be substituted to a in the formula and the no after + symbol can be substituted for b and the number after = can be substituted for c in the formula and u can get the answer.Check out ul get the value pf x =2 in all the equations |

shikhartandon | Posted - 12 April 2002 10:24 See the equation u have given is of the form ax+b=c where a , b , c are any three numbers.The equation acyually means find a number ''x'' such that if u multiply it with a and add b to the result then u should get c. And here x is given by the formula <BR> x = ( c-b)/a<BR> Try solving the equations for practice <BR> 3x+2=8<BR> 5x+5 = 15<BR> 9x+2 = 20</P><P> Here the number beside x xan be substituted to a in the formula and the no after + symbol can be substituted for b and the number after = can be substituted for c in the formula and u can get the answer.Check out ul get the value pf x =2 in all the equations |

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