Answer:
15. a. 20x + 15y = 1000
16. a. 20
17. b. 26
Step-by-step explanation:
No need for an explanation for no. 15
16.
[tex]\rm 20x + 15y = 1000[/tex]
Given:
[tex]\implies \rm 20(35) + 15y = 1000[/tex]
[tex]\implies \rm 700 + 15y = 1000[/tex]
[tex]\implies \rm 15y = 1000 - 700[/tex]
[tex]\implies \rm y = \frac{1000-700}{15}[/tex]
[tex]\implies \boxed{\rm y = 20}[/tex]
17.
[tex]\rm 20x + 15y = 1000[/tex]
Given:
[tex]\implies \rm 20x + 15(32) = 1000[/tex]
[tex]\implies \rm 20x + 520 = 1000[/tex]
[tex]\implies \rm 20x = 1000 -520[/tex]
[tex]\implies \rm x = \frac{1000-520}{20}[/tex]
[tex]\implies \rm x = 26[/tex]
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