How do you solve the system with the substitution method? x - y = 10 -x - y = 20 x - y = 10
-x - y = 20 x = y + 10 {added y to each side of top equation} -(y + 10) - y = 20 {substituted (y + 10), in for x, into bottom equation} -y - 10 - y = 20 {distributed negative sign through parentheses} -2y - 10 = 20 {combined like terms} -2y = 30 {added 10 to each side} y = -15 {divided each side by -2} x = y + 10 {transformed top equation} x = -15 + 10 {substituted -15, in for y, into new top equation} x = -5 {combined like terms} x = -5 and y = -15 - Algebra House
0 Comments
Your comment will be posted after it is approved.
Leave a Reply. |
Algebra Examples Playlist
Examples
All
|