Solve the system by substitution.
x - 6y = -1
9x - 7y = 38
(4, 2)
(-5, 2)
No solution
(5, 1)
2007-07-03 14:23:47 · 9 answers · asked by Mark W 2 in Science & Mathematics ➔ Mathematics
Hey there!
Here's the answer.
x-6y=-1 -->
x=-1+6y -->
x=6y-1 -->
9x-7y=38 -->
9(6y-1)-7y=38 -->
54y-9-7y=38 -->
47y-9=38 -->
47y=47 -->
y=1 -->
x-6y=-1 -->
x-6(1)=-1 -->
x-6=-1 -->
x=5 -->
(x,y) -->
(5,1)
So the solution set is (5,1).
Hope it helps!
2007-07-03 15:01:08 · answer #1 · answered by ? 6 · 0⤊ 0⤋
x= 8 y=1
x=5 y=1
-2
+8
-4
2007-07-03 22:21:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
x - 6y = -1 --> x = 6y-1
9x - 7y = 38
9(6y-1) -7y = 38 <-- Substitution made here
54y - 9 -7y = 38
47y = 47
y = 1
x = 6y -1 = 6*1-1 = 5
2007-07-03 21:29:53 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
5, 1
5 - 6(1) = -1
9(5)-7(1)=38
2007-07-03 21:28:41 · answer #4 · answered by angelite16 3 · 0⤊ 0⤋
Just plug the values into the equation and see which work out. If the ordered pair (x, y) do not work in the first equation, then no need to go to the next equation. The ordered pair that works for both equations is the correct answer.
2007-07-03 21:29:21 · answer #5 · answered by Anonymous · 0⤊ 1⤋
x=6y-1
9(6y-1)-7y=38
54y-9-7y=38
47y=47
y=1
x=6(1)-1=5
Ans. (5,1)
2007-07-03 21:28:21 · answer #6 · answered by Anonymous · 0⤊ 0⤋
well just to start from eqn 1 rearrange the eqn to get in terms of x and sub that int eqn 2
that will give you a value for y
and u should be able to finish it from there
2007-07-03 21:29:48 · answer #7 · answered by sin2acos2a1 2 · 0⤊ 1⤋
wow dude are you having people do your homework cause that's just wrong :]
2007-07-03 22:17:52 · answer #8 · answered by Anonymous · 0⤊ 0⤋
do your own homework! don't make people on here do it for you!
2007-07-03 21:27:20 · answer #9 · answered by looneylovegood4 2 · 0⤊ 4⤋