What is y=1/2x +2 y= -x +5 using subsitution

Y=1/2x+2
y=-x+5
subsitute since they both equal y
1/2x+2=y=-x+5
1/2x+2=-x+5
subtract 2 from both sides
1/2x=-x+3
multiply both sides by 2
x=-2x+6
add 2x to both sides
3x=6
divide both sides by 3
x=2
subsitue
y=-x=5
y=-2+5
y=3

x=2 and y=3
solution in (x,y) form is (2,3)

Kilometers in 1cm=1/1,00,000

=0.00001

Therefore, Kilometers in 3 cm=3×0.00001

=0.00003km