Need help to solve it using Substitution method

y= x-7
y= -4x-2

Acourt reporter is transcribing an accident report from germany. the report states that the driver was traveling 80 kilometers per hour. how many miles per hour was the driver traveling?

The gdp is $1,465.2 billion. the population is 249,793,675. find the per capita gdp.

Which of the following is true about the following construction of a tangent to a circle from a point outside of the circle?