marnie16 marnie16

12-09-2020
Mathematics

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The equation y = mx + c is satisfied when
x=-1, y = 3, and also when x = 2, y=5
Find the values of m and c.

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Lamhonganhduc Lamhonganhduc

12-09-2020

Y=mx+c
X=-1; y=3 => 3=(-1).m+c
X=2; y=5 => 5=2.m+c
We have equations:
{(-1).m+c=3
{2.m+c=5

<=>{-3m=-2
{2.m+c=5

<=>{m=2/3
{c=11/3

So m=2/3 and c=11/3 we have y=2/3.x+11/3

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