Algebra help?

+1 vote

Please help.I'm really bad at math and its on a test
Use substitution to solve the following systems


2x = 3y

x + 2y = 7

asked Jan 5, 2012 in Calculus by anonymous
    

1 Answer

0 votes
Okay, first off you want to begin by isolating either x or y.

Lets start with x.  So equation 1. 2x=3y is simplified to x=3/2 y (after you divide both sides by 2)  Now you have solved for x in terms of y.

In equation 2, you plug in 3/2y where the x is to get: 3/2 y +2y=7, and so 7/2 y = 7  Now to solve for y, just divide both sies by 7/2, resulting in y=2.

Now you have one answer, y =2.  Substitute 2 for y in the equation for x and there you go! hope this helps!
answered Jan 5, 2012 by kirby ~Expert~ (3,020 points)

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