Final answer:
To find the equation, set up a system of equations based on the given information. The equation is 10x + 20y = 150. To find how many T-shirts Anna can buy with the money she has left, subtract the cost of the T-shirts she buys from her total amount. The equation is x = (150 - 20y) / 10.
Step-by-step explanation:
To find the equation, we can set up a system of equations based on the given information. Since Anna spends $150 in total, we can write the equation: 10x + 20y = 150, where x represents the number of T-shirts and y represents the number of pairs of jeans. To find how many T-shirts Anna can buy with the money she has left, we can subtract the cost of the T-shirts she buys from her total amount. Let's assume she buys x T-shirts, so the equation becomes: 10x = 150 - 20y. Simplifying the equation, we have: x = (150 - 20y) / 10. This equation gives us the number of T-shirts Anna can buy with the money she has left, depending on the number of pairs of jeans she buys.