Ôn tập về số nghiệm của hệ phương trình

A coordinate plane. The x- and y-axes both scale by one-half. A graph of a line goes through the points negative one-half, three and three, two. A graph of another line goes through the points zero, zero and one, one. These two lines intersect at an x-value between two and three and a y-value between two and three.

A coordinate plane. The x- and y-axes both scale by one-half. A graph of a line goes through the points one, one and a half and three, one. A graph of another line goes through the points one, two and a half and three, two. These two lines never intersect.

A coordinate plane. The x- and y-axes both scale by one-half. A graph of a line goes through the points zero, one and a half and three, two. A graph of another line goes through the points zero, one and a half and three, two. These lines overlap entirely.

A coordinate plane. The x- and y-axes both scale by one-half. The equation y equals negative six x plus eight is graphed going through the points zero, eight and one, two. The equation three x plus y equals negative four is graphed going through the points zero, negative four and one, negative seven. These lines intersect at a value that is below the graph.