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)