Maths

Solve:
1. {
?? = -3?? + 7
5?? – 4?? = 6
2. {
?? = -1
4?? – 3?? = 7
3. {
-4?? + ?? = 4
-5?? – ?? = 5
4. {
?? + 3?? = 9
-3?? – 3?? = -15 5. {
-3?? – 4?? = 7
3?? + 3?? = -6
6. {
-5?? – 8?? = 25
2?? – 7?? = 41 7. {
-7?? – 8?? = 16
-4?? + 9?? = -18
8. {
-4?? – 2?? = -12
-10?? + 7?? = -6
9. {
1 = -20?? – 7??
10?? – 16 = 2??
10. A 40% dye solution is to be mixed with a 70% dye solution to get 120 L of a 50%
solution. How many liters of the 40% and 70% solutions will be needed?
11. Solve: {
?? < 2??
?? = -2?? – 5

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