A. solve for 1 variable let's solve for x in 2nd equation add 2y to both sides x=2y+4 sub 2y+4 for x in other equation 3(2y+4)+y=5 6y+12+y=5 7y+12=5 minu12 both sides 7y=-7 divide 7 y=-1 sub back x=2y+4 x=2(-1)+4 x=-2+4 x=2 (2,-1)
B. eliminate eliminate y's multiply first equation by 2 and add to first
6x+2y=10 <u>x-2y=4 +</u> 7x+0y=14
7x=14 divide by 7 x=2 sub back x-2y=4 2-2y=4 minus 2 -2y=2 divide -2 y=-1 (2,-1)
If you just think of a line graph you could do this on the y axis go up 6 and on the x axis go left 8 and make a right triangle with the 2 points you made and the origin and then use your equation to solve for the missing side