1.
Rearrange one equation to get either x on its own, or y on its own, so you want either x = ay + b, or y = ax + b
2.
Now take your other equation ax + by = c and replace either x or y, depending on which you isolated in step 1, with what it equals in step 1.
3.
Expand the brackets and move the numbers around until its in a correct form.
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