USE SUBSTITUTION TO SOLVE EACH SYSTEM OF EQUATIONS. CHECK SOULTION?
SUMMER HELP PLEASE
2007-06-24 15:12:12 · 4 answers · asked by king 1 in Science & Mathematics ➔ Mathematics
You need the second problem equal to something
2007-06-24 15:17:11 · answer #1 · answered by leo 6 · 0⤊ 0⤋
This is not a system of equation. The second part is missing the right hand side.
Substitution means that you will replace one of the variables, in one equation, by its value from the other equation.
Since we can only work with the first one for now. let us find x in that one:
3x + 4y = 11
3x = 11 - 4y
x = (11 - 4y)/3
When you have the second equation, replace the x there by the value we just found above. Then you will have an equation with only one variable: y.
2x + 4y = ?
2[(11-4y)/3] + 4y = ?
22/3 -8y/3 + 4y = ?
Put everything over the same denominator:
22/3 - 8y/3 + 12y/3 = 3?/3
and continue from there
2007-06-24 22:20:46 · answer #2 · answered by Raymond 7 · 0⤊ 0⤋
No problem except you are missing a vital piece of information, 2x + 4y equals what?
2007-06-24 22:18:18 · answer #3 · answered by stuart b 2 · 0⤊ 0⤋
From second eq. x=-2Y
-6Y + 4Y = 11: -2Y = 11:
Y = - 11/2
X = 11
My solution checks. Of course you should check it also!
2007-06-24 22:18:26 · answer #4 · answered by telsaar 4 · 0⤊ 0⤋