Question

Help PLS
On a math test, Larissa was asked to find the points where the equations y = x2+ x – 4 & y = -2x + 6 intersect.

Larissa’s solution is shown below.

Larissa checks her answer and realizes she has made a mistake. On which line did Larissa make her mistake?

Explain Larissa's mistake using 1-3 complete sentences.

Answer 1

Answer:

Her mistake is on line 2, setting the equations equal to each other.

Step-by-step explanation:

It appears that she misunderstood the requirements of  question: find the intersections of the graphs of the two equations. The first one is a quadratic equation, (mentally picture that as a parabola). The second equation is linear. (Mentally picture that as a straight line with a slope of -2) They should have 2 points of intersection. When she combined them, she created a new quadratic equation and solved to "find the zeroes" where the parabola intersects the x-axis.