Answer:
y = -5x + 7
Explanation:
Isolate the variable y.
Subtract 15x from left side and add to right.
Now its: 3y = 21 - 15x
Divide 3 from both sides.
y = 7 - 5x
Convert to slope intercept form: y=mx+b
Final answer: y = -5x + 7
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