Solve this using the subsitution method?

0 ⤊

Solve this using the subsitution method?

5X+9y=11
3X-2y=-23

2006-12-14 14:36:52 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help

3 answers

One way:
Solve 5x + 9y = 11 for x.
x = (11-9y)/5

Substitute (11-9y)/5 for x in 3x-2y = -23 & solve for y. Use that y value in 5x+9y = 11 to find x value.

2006-12-14 14:45:22 · answer #1 · answered by S. B. 6 · 0⤊ 0⤋

x=(11-9y)/5

3/5[11-9y] - 2y = - 23

3[11-9y] - 10y = - 115

33 -27y -10y = - 115

148 = 37y

4 = y

Then, to solve for x, substitute 4 for y in one of the formulas and solve for x.

2006-12-14 22:46:53 · answer #2 · answered by Piguy 4 · 0⤊ 0⤋

y= 4
x= -5

2006-12-14 22:50:35 · answer #3 · answered by krazykiddz 3 · 0⤊ 0⤋