Please help I’ve been stuck for a few hours

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

What is the measure of sty in oo below? 130 310 230 50

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.