life

Mr.Thompson is on a diet. He currently weighs 260 pounds. He loses 4 pounds per month. After how many months will Mr. Thompson reach his goal weight of 220 pounds? in standard form and slope intercept form

x = month

slope intercept form: $y= 260-4x$

standard form: $4x + y= 260$

$\begin{array}{rcl} 220 &=& 260 - 4x \\ 4x &=& 260-220\\ 4x &=& 40 \qquad | :4 \\ x &=& \frac{40}{4} \\ \mathbf{x} & \mathbf{=} & \mathbf{10} \end{array}$

Mr. Thompson reach his goal weight of 220 in 10 month