Question 173681
1. there are infinite solutions to y=x-8...this is an equation of a line....and all the points that make up that line are solutions.  If you choose x to be 1 you plug it into the equation and solve for y. y=1-8=-7..so one ordered pair is (1,-7)....and this can go on forever.
:
2. we need to use the point slope formula to write this equation.  In order to do this we need m the slope. m=change in y/change in x. Using our 2 points we have: -2-9/-5-(-5). The denominator is -5+5=0.  Therefore this make the slope undefined. when a slope is undefined we know we have a vertical line and that line is parallel to the y axis and all x's equal -5 while y and be any value. the equation is written as x=-5
:

3.we know that 1cm=10mm{{{6.5432 (mm^2) * (1/10)(cm/mm)}}}
:
so 6.5432/10={{{.65432}}}{{{(mm)cross(mm^2)cm/cross(mm)}}} our goal is {{{mm^2}}}so
:
 we have 1 more step.
: 
{{{.65432 (mm) (cm) * (1/10)(cm/mm)}}}
:
.65432/10={{{highlight(.065432)}}}   {{{cross(mm)cm^2/cross(mm)}}}
:
1 sq centimeter = 100 square millimeters that is why we end up multiplying by 
1/10 and 1/10 which = 1/100...the steps are to show how we get from {{{mm^2}}} to {{{cm^2}}}