Question

4 linear equation Q1: y=5-0.8a Q2: y=10-b Q3=Q1+Q2 Q4:y=0.4c If a+b=c, then which point does Q4...

4 linear equation

Q1: y=5-0.8a

Q2: y=10-b

Q3=Q1+Q2

Q4:y=0.4c

If a+b=c, then which point does Q4 intersects with Q3?

The answer is (3.42,8.55) Want to know the step plz.

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