Asked by Anonymous

solve by elimination method

7x+15y=32
x-3y=20
Answered by drwls
Plug in 20 + 3y for x in the first equation, and solve the resulting equation for y. Here's how it starts off.

7(20+3y) + 15y = 32
140 + 21y + 15y = 32
36 y = 108

Take it from there