What is the first step to solve the following system of equations using substitution? X-y=-1
2x-y=3

What expression is equivalent to 1/2(2+3x-6)

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Which expression shows the sum of the polynomials with like terms grouped together