Question 224357
3x + y = 7
y = 7-3x


grad = negative reciprocal of -3 = 1/3


new equation :
y = 1/3x + b

sub(4,3)
3 = 1/3(4) + b
3 - 4/3 = b
5/3 = b


new equation will be :
y = 1/3x + 5/3
3y = x + 5(ans)