How do you solve this system of equations by substitution: # - x+y = 40 and y = 9x#?
2 Answers
Dec 10, 2017
Explanation:
Substitute value of
(1)
Now substitute this value of
Dec 10, 2017
Explanation:
#-x+y=40to(1)#
#y=9xto(2)#
#color(blue)"substitute "y=9x" into equation "(1)#
#-x+9x=40#
#rArr8x=40#
#"divide both sides by 8"#
#(cancel(8) x)/cancel(8)=40/8#
#rArrx=5#
#"substitute this value into equation "(2)#
#y=9xx5=45#
#rArr"point of intersection "=(5,45)#