id0617045
07.12.2020 •
Mathematics
Solve the following system of equations graphically on the set of axes below.
y = -2x – 7
3x – y = 2
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Ответ:
Step-by-step explanation:
An auto mechanic has two bottles of battery acid. One bottle contains a 10% acid solution, and the other contains a 4% acid solution. How many units of each solution are needed to make 120 units of a 6% acid solution?
Let the number of units for 10% = x
Let the number of unit of 4% = y
Hence:
x + y = 120... Equation 1
10% × x + 4% × y = 6% × 120
0.10x + 0.04y = 7.2 Equation 2