john paid $34 for 2 algebra books and three geometry books. he paid $36 for 3 algebra and two geometry books. cost for each book?
WOW Hayley! You answer that question in less than 3 minutes!
You get the right answer too. hahaha
Algebra book cost x
geometry book cost y
2x+3y=34
3y=-2x+34
y=(-2/3)x+34/3
3x+2y=36
substitute y in the equation
3x+2((-2/3)x+34/3)=36
3x-(4/3) x +68/3=36
multiply equation by 3
9x-4x+68=108
5x=40
x=8 , algebra book cost
plug x in equation 2x+3y=34 to get y=6
Was I helpful at all? (:
yess ty but i ran out of time for the test we were taking :(
WOW Hayley! You answer that question in less than 3 minutes!
You get the right answer too. hahaha