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y = x + 7 and y = -x+ 2
_Y = 5x and y = 5x - 1
2x + y = 1 and 2y + 4x = 2
Y = 2x + 3 and y = -x - 4

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ANSWERS:
1. x+7=-x+2
2x=-7+2
2x=-5
x=-5/2
y=-5/2+7=9/2

2. y=5x,y=5x-1
{x=y/5
{y=-1+y

3. {2x+y=1 and {2y+4x=2
{2x+y=1 and {4x+2y=2
{2x+y=1 and {2x+y=1
2x+y-(2x+y)=1-1
2x+y-2x-y=1-1
0=1-1
0=0

4. y=2x+3,y=-x-4
{x=-3/2+y/2
{y=-5/2-y/2

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