If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.
3x – 5y + z = 12
x + 6y – z = –4
2x – 5y – 2z = –8
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subtract the first and last equation to cancel y . keep the z in one side and take others to the other side of equation . now substitute this equation instead z .
now you have a equation just with x .
if need more help i'd help u .
What is the equation of the line that passes through the point (2, 3) and is perpendicular to the line y = –x – 3?
the slope of y=-1x-3 is -1 ok ?
for a line perpendicular to it u should chose ur slope=-1(ex slope )
here slope = -1(-1)=1
the formula is y=mx+a
substitute the slope with m and by plugging the point in the equation find a