Why is the equation of the line that has a slope of 4 and a y intercept of -7​

Flashback to semester a. are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr? show your work.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36