S2 summer holiday homework
21. which of the following equations are linear equations in two unknowns?
i. xy + 2y=3
1. x-2y = y
iii. 3x + 2y = 5
.
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii and iii

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in