solve the system of linear equations by substitution
6x-9=y -----> equation A
y=-3x ------> equation B
substitute equation A in equation B
6x-9=-3x
solve for x
6x+3x=9
9x=9
x=1
Find the value of y
substitute the value of x in equation A or equation B (is the same result)
y=-3(1)=-3
the answer is
