Which lines are perpendicular to 7x – 3y = 18?

Choose all answers that are correct.
(Points : 1)
3x + 7y = 42
3y = 7x – 15
3x – 7y = 21
–7y = 3x + 1

Question

Which lines are perpendicular to 7x – 3y = 18?

Choose all answers that are correct. 
(Points : 1)
        3x + 7y = 42 
        3y = 7x – 15 
        3x – 7y = 21 
        –7y = 3x + 1

godlovesme · Answer

first change  all equations to slope-intercept formula @FlowerChald

anonymous · Answer

ok ill try to do that

anonymous · Answer

the formula is y=mx+b right?

godlovesme · Answer

yes

anonymous · Answer

how excatly would i change the answers into intercept form?

igreen · Answer

Just rearrange the equations.

Slope intercept form is y = mx + b.

godlovesme · Answer

u wanna get y alone so just solve for y

igreen · Answer

3x + 7y = 42

Subtract 3x to both sides:

7y = -3x + 42

Divide 7 to both sides:

y = -3/7x + 6

Okay, now you try the rest.

anonymous · Answer

ok thank you