math
posted by pam on .
solve the system of equations by elimination.
3x4y=22
2x+5y=7

3x  4y = 22
2x + 5y = 7
To eliminate variable x,
Multiply by 2 (3x  4y = 22)
Multiply by 3 (2x + 5y = 7)
Add equations
6x + 8y = 44
6x + 15y = 21
0 + 23y = 23
23y = 23
y = 1
To find x,
substitute y = 1, in 2x + 5y = 7
2x + 5y = 7
2x  5 = 7
2x = 12
x = 6
x = 6, y = 1 
x=6

3x+4y=22