Question 109733
{{{b = 5x + 7y}}}
substitute (-3,4)
{{{b = 5*-3 + 7*4}}}
{{{b = -15 + 28}}}
{{{b = 13}}} answer
again, substitute (-3,4)
{{{mx + y = 22}}}
{{{mx = 22 - y}}}
{{{m = (22 - y) / x}}} note that x can't be 0!
{{{m = (22 - 4) / -3}}}
{{{m = 18/-3}}}
{{{m = -6}}} answer
check the answers
{{{5x + 7y = b}}}
{{{5*-3 + 7*4 = 13}}}
{{{-15 + 28 = 13}}}
{{{13 = 13}}}
OK
{{{mx + y = 22}}}
{{{-6*-3 + 4 = 22}}}
{{{18 + 4 = 22}}}
{{{22 = 22}}}
OK