to eliminate y, multiply the first equation by 5 and the second equation by 3:
20 x + 15 y = 60
21 x + 15 y = 78
--------------------subtract
-1 x = - 18
so
x = 18
so
4(18) + 3 y = 12
72 + 3 y = 12
3 y = -60
y = -20
-----------------------
check that to be sure
7(18) + 5 (-20) = ???? 26
126 - 100 = 26 sure enough it checks
What is the solution of the system ??
4x+3y= 12
7x+5y=26
a.(18,20)
b.(18,-20)
c.(-20,18)
d.(20,18)
is it c?
9 answers
so its b @damon?
Yes, but no need to ask is there?
nope. you helped alot.
@damon can you help me with this one ?
What is the solution of the system? use substitution . 4x+2y=10, y=-3x+6
My answer chosies are
a. (1,-3)
b.(1,3)
c.(3/10, 4/5)
d.(-2,-2)
What is the solution of the system? use substitution . 4x+2y=10, y=-3x+6
My answer chosies are
a. (1,-3)
b.(1,3)
c.(3/10, 4/5)
d.(-2,-2)
is it b? @damon
Henry and I have both done this already, scroll down.
http://www.jiskha.com/display.cgi?id=1452020437
Start trying to do them and stop asking us to do it all.
Start trying to do them and stop asking us to do it all.
yall have helped alot .