Plz will give brainliest and rating plus 19 points a straight line with a gradient of 3 passes through the point with co-ordinates (0,7) write down equation of line? a second line perpendicular to the first passes through the point (0,2) write down equation of this line and plz explain

As the general formular for a straight line is


m represents the gradient
c represents the point at which the line crosses the y axis.
Therefore you simply plug the numbers into the equation.


You can work out whether 2 lines are perpendicular by multiplying their gradients. The product of the gradient of perpendicular lines will always be -1.
If lines are perpendicular, M1× M2 = − 1
So you can rearrange the equation to get M2=-1/M1.
As they perpendicular they have to intercept at the same point on the Y axis therefore you get the equation