Nobody know, I’m sorry I would help you but I don’t know ♂️
Answer:
D.51.34°
Step-by-step explanation:
tan(angle wvx)=WX/WV
i.e,tan(angle wvx)=5/4=1.25
i.e,angle wvx=tan⁻¹(1.25)
=51.34°
He should have written x= y2 + 12y .X must be less than or equal to zero. It should be x <0.
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In order for two lines to be perpendicular, their gradients must multiply together to get -1
7*b=-1
7b=-1
Divide both sides by 7
So, the gradient of line b is -1/7