Question 386322
I need help to show me how to work out the use the substitution to solve the equations and state if it has no solution or infinitely many solutions: 2x+7y=3   x=1-4y
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Substitute for "x" and solve for "y":
2(1-4y) + 7y = 3
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2 - 8y + 7y = 3
2 -y = 3
y = 2-3
y = -1
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Since x = 1-4y, solve for "x":
x = 1-4*(-1)
x = 5
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Check the answer:
2x+7y=3
2(5)+7(-1) = 3
10-7 = 3
3 = 3
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Solution: (5,-1)
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Cheers,
Stan H.