Answer:
When you are typing your question, on the bottom, there should be icons for bold, italic, and underline. The very last one is a paperclip looking icon. If you click on the paperclip, it will ask you to add a photo. If you're using a laptop/computer, then you need to save your picture in your files. Then just click on the picture you want to add.
I'm assuming this means solve for x in which case:
y=ax+b
y-b=ax
(y-b)/a = x
Answer:
create a circle with the origin as its centre and a radius of the origin and point a then locate a point on a circle that is 90 degrees clockwise from point a.
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25 is the answer hope it helped