If the equation 9 - 2x = ax +b has infinite solutions, what must be the value of a?

Me find the missing dimension of a triangle height: 7 in., area: 21^2

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x