Lines 3x-2y+7=0 and 6x+ay-18=0 is perpendicular. What is the value of a? 1/9
9
-9
-1/9

Pls answer​

Step-by-step explanation:

Two lines are given to us which are perpendicular to each other and we need to find out the value of a . The given equations are ,

Step 1 : Convert the equations in slope intercept form of the line .

and ,

Step 2: Find the slope of the lines :-

Now we know that the product of slope of two perpendicular lines is -1. Therefore , from Slope Intercept Form of the line we can say that the slope of first line is ,

And the slope of the second line is ,

Step 3: Multiply the slopes :-

Multiply ,

Multiply both sides by a ,

Divide both sides by -1 ,

Hence the value of a is 9 .

where are the choices?

step-by-step explanation: