The slope of the line containing (2,7) and (5,2) is $\displaystyle\frac{{{2}-{7}}}{{{5}-{2}}}=\frac{{-{5}}}{{3}}\ne-{3}\usepackage{cmbright}\Huge\$ . The slope of the line containing (2,7) and (5, y) is $\displaystyle\frac{{{y}-{7}}}{{{5}-{2}}}=\frac{{{y}-{7}}}{{3}}\usepackage{cmbright}\Huge\$ . For what y will this equal -3?