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How do you solve this using the system of substitution y quals -3x 5 and 5x-4y equals -3?
Wiki User
∙ 12y ago
Simply take the first equation and substitute it for y in the second one.
We're told:
y = -3x + 5
and:
5x - 4y = -3
So we can say:
5x - 4(-3x + 5) = -3
5x + 12x - 20 = -3
17x = 17
x = 1
Then plug that value into one of our original equations to solve for y:
y = -3x + 5
y = -3(1) + 5
y = 5 - 3
y = 2
So the two equations intersect at the point (1, 2).
Wiki User
∙ 12y ago
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