Substitution methode:
y=2x-5
4x-y=7
i thought you do it like this:
4x-2x-5=7
2x-5=7
2x=12
x=6
but that's not right.. what did i do wrong?

Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Which of the following contains a variable?