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3 years ago

Solve by the linear combination method (with or without multiplication). x + y = 40 0.08x + 0.03y = 1.7

1 answer:

4 0

That's also known as the addition method.
x + y = 40
.08x+.03y=1.7
We need to multiply the top equation by either a -.08 or a -.03 to eliminate one of the variables. Let's get rid of the y:
-.03(x + y) = -.03(40) which gives us

-.03x - .03y = -1.2
.08x + .03y = 1.7
When we add those together we are left with .05x = .5 and x = 10. If we sub that 10 in for x into the first equation (either would have worked but the first one is way easier to work with!) we get 10 + y = 40 and y = 30. So the solution to the system is (10, 30)

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Given ∆ABC with vertices A(−4, −3), B(0, 0), C(2, −3) and ∆DEF with vertices D(3, 1), E(6, -3), F(3, −5), use the definition of

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Two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other.

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<span>The sum of the interior angles of a triangle is 180 degrees
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