Algebra HELP
posted by electra .
USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (please show steps)
1) X+8Y=16 2) 4X+5Y=2 3)4Y=153X
3X+4Y=36 5X4Y=23 2Y=3X+21

I will do one. Then, I will happily critique your thinking on others. Take the third.
4y=153x
2y=3x+21
double the second one..
4y=153x
4y=6x+42
subtract, then the result is ..
0=9x45 and solve for x.