Where are the vertical changes, Horizontal change, and slope

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

What is the absolute value of the complex number -4-sqrt2i