Line a passes through (-1, 1) and (1, 3)
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<h2>The area A of a triangle is given by the formula A=1/2*b*h where b is the base and h is the height of the triangle.</h2>
Step-by-step explanation:
<h2>The photo which is in the attachment is an example for your question. </h2><h2>hope this answer helps you!!</h2>