Question

2s^2 + r - t = yEvaluate for y if:s= 4r= -3t= 7

Answer 1

We are given an expression for y in terms of s, r and t, and we are also given their values. We just need to replace those values in the equation as follows:

$\begin{gathered} y=2s^2+r-t \\ \\ y=2\cdot(4)^2+(-3)-7 \end{gathered}$

Solving:

$\begin{gathered} y=2\cdot16-3-7 \\ \\ y=32-10 \\ \\ y=22 \end{gathered}$

Then, the value of y is 22.