Saturday

December 20, 2014

December 20, 2014

Posted by **jenny** on Tuesday, November 14, 2006 at 11:49pm.

How can you solve equations like these?

9r + 7 = 4r - 8

Need to get the r on one side.

1st- subtract 4r from the right side of the = sign. What you do to one side do to the other. 9r-4r+7=4r-4r-8. 5r+7=-8

2nd- subtract 7 from the left side to get r's by themselves. 5r+7-7=-8-7....5r=-15.

Divide 5r by 5.....remeber do it to both sides......5r/5=-15/5......r=-3

check answer.

9(-3)+7=4(-3)-8....-27+7=-12-8............-20=-20

Thanks for your help. I'm completely lost. Can you explain how 9r+7 = 4r-8?

- math -
**pasheeta**, Monday, January 19, 2009 at 11:19amr=-3

- math -
**Anonymous**, Monday, March 23, 2009 at 4:28pm4.9u+5.87=23.81

- math -
**Anonymous**, Friday, May 10, 2013 at 2:23pmwhat is rule for input value of n?

**Answer this Question**

**Related Questions**

Basic Math - I forgot how to solve for two variables... Please check if I solved...

algebra 2 - how do you solve quadratic equations by finding square roots i have ...

help me for this stupid worksheet - the question is.. why did the ghost decide ...

algebra 2 - how do you solve quadratic equations by finding square roots i have ...

math - I need help solving these equations -5s+3s-2s=48 6m=5m-2+m 5d=-2d-24 you ...

MATH - ok so I'm learning to solve problems like cos(x)=2 and sin(x)=5 I've ...

Math - I just don't understand this question: h(t)=A*b^x h(3)=4 h(5)=40 Solve ...

MATH-Stuck :-( - I really need help factoring these special Trinomials. This ...

MATH-STUCK :-( - I really need help factoring these special Trinomials. This ...

algebra - i need help with these problems (either a solution or how to plug them...