How is a system of two linear inequalities in two variables similar to a system of two linear equations in two variables? How is it different?

Use the multiplier method to incrases £258 by 43%

The trigonometric ratios sine and secant are reciprocals of each other

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?