Question

X(7 – 2y)use x = 5 and y = -4

Answer 1

Evaluate the expression;

`x(7-2y)`

Where x = 5 and y = -4,

The expression becomes

`\begin{gathered} =5(7-2\lbrack-4\rbrack) \\ =5(7-\lbrack-8\rbrack) \\ =5(7+8) \\ =5(15) \\ =75 \end{gathered}`

You simply substitute for the values of 5 in place of x, and -4 in place of y