Question

How do you graph using the intercepts for `4x + 3y = -21`?

Answer 1

`"see explanation"`

Explanation:

`"to find the intercepts, that is where the graph crosses"`
`"the x and y axes"`

`• " let x = 0, in the equation for y-intercept"`

`• " let y = 0, in the equation for x-intercept"`

`x=0rArr3y=-21rArry=-7larrcolor(red)"y-intercept"`

`y=0rArr4x=-21rArrx=-21/4larrcolor(red)"x-intercept"`

`"plot the points "(0,-7)" and "(-21/4,0)`

`"draw a straight line through them for graph"`
graph{(y+4/3x+7)((x-0)^2+(y+7)^2-0.04)((x+21/4)^2+(y-0)^2-0.04)=0 [-20, 20, -10, 10]}