Question

A pair of linear equations is shown below:

y = –x + 1
y = 2x + 4

Which of the following statements best explains the steps to solve the pair of equations graphically?

On a graph, plot the line y = –x + 1 which has y intercept = –1 and slope = 1; and y = 2x + 4 which has y intercept = 2 and slope = 4; and write the coordinates of the point of intersection of the two lines as the solution.

Answer 1

On a graph, plot the line y = –x + 1 which has y intercept = 1 and slope = 1; and y = 2x + 4 which has y intercept = 1 and slope = 4; and write the coordinates of the point of intersection of the two lines as the solution.

On a graph, plot the line y = –x + 1 which has y intercept = 1 and slope = –1; and y = 2x + 4 which has y intercept = –2 and slope = 2; and write the coordinates of the point of intersection of the two lines as the solution.

On a graph, plot the line y = –x + 1 which has y intercept = 1 and slope = –1; and y = 2x + 4 which has y intercept = 4 and slope = 2; and write the coordinates of the point of intersection of the two lines as the solution.

Answer 2

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