sat suite question viewer
Algebra
/ Linear equations in two variables
Difficulty: Medium
The equation represents the number of blue tiles, , and the number of green tiles, , an artist needs for an -square-inch tile project. The artist needs blue tiles for the project. How many green tiles does he need?
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Explanation
The correct answer is . It’s given that the equation represents the number of blue tiles, , and the number of green tiles, , an artist needs for an -square-inch tile project. It’s also given that the artist needs blue tiles for the project. Substituting for in the equation yields , or . Subtracting from both sides of this equation yields . Dividing both sides of this equation by yields . Therefore, the artist needs green tiles for the project.